How to Give Effective Presentation Feedback

A conversation with sam j. lubner, md, facp.

Giving an effective scientific presentation, like all public speaking, is an acquired skill that takes practice to perfect. When delivered successfully, an oral presentation can be an invaluable opportunity to showcase your latest research results among your colleagues and peers. It can also promote attendee engagement and help audience members retain the information being presented, enhancing the educational benefit of your talk, according to Sam J. ­Lubner, MD, FACP , Associate Professor of Medicine and Program Director, Hematology-Oncology Fellowship, at the University of Wisconsin Carbone Cancer Center, and a member of ASCO’s Education Council.

Sam J. ­Lubner, MD, FACP

Sam J. ­Lubner, MD, FACP

In 2019, the Education Council launched a pilot program to provide a group of selected speakers at the ASCO Annual Meeting with feedback on their presentations. Although some of the reviewers, which included members of the Education Council and Education Scholars Program, as well as ASCO’s program directors, conveyed information to the presenters that was goal-referenced, tangible, transparent, actionable, specific, and personalized—the hallmarks of effective feedback—others provided comments that were too vague to improve the speaker’s performance, said Dr. Lubner. For example, they offered comments such as “Great session” or “Your slides were too complicated,” without being specific about what made the session “great” or the slides “too complicated.”

“Giving a presentation at a scientific meeting is different from what we were trained to do. We’re trained to take care of patients, and while we do have some training in presentation, it usually centers around how to deliver clinical information,” said Dr. Lubner. “What we are trying to do with the Education Council’s presentation feedback project is to apply evidence-based methods for giving effective feedback to make presentations at ASCO’s Annual Meeting, international meetings, symposia, and conferences more clinically relevant and educationally beneficial.”

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The ASCO Post talked with Dr. Lubner about how to give effective feedback and how to become a more effective presenter.

Defining Effective Feedback

Feedback is often confused with giving advice, praise, and evaluation, but none of these descriptions are exactly accurate. What constitutes effective feedback?

When I was looking over the literature on feedback to prepare myself on how to give effective feedback to the medical students and residents I oversee, I was amazed to find the information is largely outdated. For example, recommendations in the 1980s and 1990s called for employing the “sandwich” feedback method, which involves saying something positive, then saying what needs to be improved, and then making another positive remark. But that method is time-intensive, and it feels disingenuous to me.

What constitutes helpful feedback to me is information that is goal-referenced, actionable, specific, and has immediate impact. It should be constructive, descriptive, and nonjudgmental. After I give feedback to a student or resident, my next comments often start with a self-reflective question, “How did that go?” and that opens the door to further discussion. The mnemonic I use to provide better feedback and achieve learning goals is SMART: specific, measurable, achievable, realistic, and timely, as described here:

  • Specific: Avoid using ambiguous language, for example, “Your presentation was great.” Be specific about what made the presentation “great,” such as, “Starting your presentation off with a provocative question grabbed my attention.”
  • Measurable: Suggest quantifiable objectives to meet so there is no uncertainty about what the goals are. For example, “Next time, try a summary slide with one or two take-home points for the audience.”
  • Achievable: The goal of the presentation should be attainable. For example, “Trim your slides to no more than six lines per slide and no more than six words per line; otherwise, you are just reading your slides.”
  • Realistic: The feedback you give should relate to the goal the presenter is trying to achieve. For example, “Relating the research results back to an initial case presentation will solidify the take-home point that for cancer x, treatment y is the best choice.”
  • Timely: Feedback given directly after completion of the presentation is more effective than feedback provided at a later date.

The ultimate goal of effective feedback is to help the presenter become more adept at relaying his or her research in an engaging and concise way, to maintain the audience’s attention and ensure that they retain the information presented.

“Giving a presentation at a scientific meeting is different from what we were trained to do.” — Sam J. Lubner, MD, FACP Tweet this quote

Honing Your Communication Skills

What are some specific tips on how to give effective feedback?

There are five tips that immediately come to mind: (1) focus on description rather than judgment; (2) focus on observation rather than inference; (3) focus on observable behaviors; (4) share both positive and constructive specific points of feedback with the presenter; and (5) focus on the most important points to improve future ­presentations.

Becoming a Proficient Presenter

How can ASCO faculty become more proficient at delivering their research at the Annual Meeting and at ASCO’s thematic meetings?

ASCO has published faculty guidelines and best practices to help speakers immediately involve an audience in their presentation and hold their attention throughout the talk. They include the following recommendations:

  • Be engaging. Include content that will grab the audience’s attention early. For example, interesting facts, images, or a short video to hold the audience’s focus.
  • Be cohesive and concise. When preparing slides, make sure the presentation has a clear and logical flow to it, from the introduction to its conclusion. Establish key points and clearly define their importance and impact in a concise, digestible manner.
  • Include take-home points. Speakers should briefly summarize key findings from their research and ensure that their conclusion is fully supported by the data in their presentation. If possible, they should provide recommendations or actions to help solidify their message. Thinking about and answering this question—if the audience remembers one thing from my presentation, what do I want it to be?—will help speakers focus their presentation.
  • When it comes to slide design, remember, less is more. It’s imperative to keep slides simple to make an impact on the audience.

Another method to keep the audience engaged and enhance the educational benefit of the talk is to use the Think-Pair ( ± Share) strategy, by which the speaker asks attendees to think through questions using two to three steps. They include:

  • Think independently about the question that has been posed, forming ideas.
  • Pair to discuss thoughts, allowing learners to articulate their ideas and to consider those of others.
  • Share (as a pair) the ideas with the larger group.

The value of this exercise is that it helps participants retain the information presented, encourages individual participation, and refines ideas and knowledge through collaboration.

RECOMMENDATIONS FOR SLIDE DESIGN

  • Have a single point per line.
  • Use < 6 words per line.
  • Use < 6 lines per slide.
  • Use < 30 characters per slide.
  • Use simple words.
  • When using tables, maintain a maximum of 6 rows and 6 columns.
  • Avoid busy graphics or tables. If you find yourself apologizing to the audience because your slide is too busy, it’s a bad slide and should not be included in the presentation.
  • Use cues, not full thoughts, to make your point.
  • Keep to one slide per minute as a guide to the length of the presentation.
  • Include summary/take-home points per concept. We are all physicians who care about our patients and believe in adhering to good science. Highlight the information you want the audience to take away from your presentation and how that information applies to excellent patient care.

Speakers should also avoid using shorthand communication or dehumanizing language when describing research results. For example, do not refer to patients as a disease: “The study included 250 EGFR mutants.” Say instead, “The study included 250 patients with EGFR -mutant tumors.” And do not use language that appears to blame patients when their cancer progresses after treatment, such as, “Six patients failed to respond to [study drug].” Instead say, “Six patients had tumors that did not respond to [study drug].”

We all have respect for our patients, families, and colleagues, but sometimes our language doesn’t reflect that level of respect, and we need to be more careful and precise in the language we use when talking with our patients and our colleagues.

ASCO has developed a document titled “The Language of Respect” to provide guidance on appropriate respectful language to use when talking with patients, family members, or other health-care providers and when giving presentations at the Annual Meeting and other ASCO symposia. Presenters should keep these critical points in mind and put them into practice when delivering research data at these meetings. ■

DISCLOSURE: Dr. Lubner has been employed by Farcast Biosciences and has held a leadership role at Farcast Biosciences.

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How to give feedback about a presentation

two women chatting

As Saturday, June 1st is officially #SaySomethingNiceDay , I thought it might be “interesting” to research (and blog about!) something I’ve personally always found difficult – how to give feedback on a presentation. As that’s a significant part of my work as a presentations trainer, it’s something I’ve done a lot of, but I’m not really thinking about that kind of thing.

Bored by your presentation?

I’m more thinking of the time when you sit through something-or-other-but-you’re-not-sure-what from Fred in Finance. He bounds up to you at the water cooler later and grins at you. Your heart sinks…

Pick the right measure of a successful presentation

The thing about presentations is that we tend to judge them by the wrong measures. Because we’re all sat in the audience, possibly chewing off our own toe-nails in an attempt to find interest and/or meaning to the presentation and the slides, we judge presentations by how well it kept our interest and entertained us. The thing is, “keeping us entertained” is not (usually) the key metric for a presentation.

coloured pencils

Of course, if we’re not interested in the presentation it’s hard to learn anything from it, so “being interesting enough” is the baseline for a successful presentation, but that doesn’t make it how you should measure it beyond that.

What you should do to measure whether a presentation was good or not was to ask two questions:

  • what was the presentation supposed to do?
  • did it do it?

If the answer to that question was “yes”, then you can go ahead an indulge praising Fred From Finance. Even if you’ve bitten off three of your toe-nails in the process.

But what about a failed presentation?

So far so good, but what do you do if the answer to the question above was “no”? That rather depends on if your job (or something similarly important) depends on the good graces of Fred From Finance. But let’s assume that you want to be reasonably honest and at the same time, reasonably positive?

How should you give feedback on a presentation?

Pretty clearly, the best option here is to get Fred to do a critique of his own work, so that you don’t need to be the one to point out the painful to him. And don’t forget, you have a moral obligation to help Fred here. Presentations cost your organisation money and morale, so letting Fred continue to get away with it is wasting time and money. Worse, bad presentations reduce the love of life! 😉

colour spectrum

Start with something specific and concrete . For example, you might want to look at the slide’s colour scheme.

Once you’ve picked your “point of entry” for feeding back, go for a question. Use an open question, not something Fred can close down with a simple yes/no. An example might be something like “I love how much work you put into the slide design – what was it that made you pick those colours?”.

By couching it in those terms, Fred won’t automatically hear what you said as a critisism. Critisism makes people defensive. After all, they’ve done what they thought was right, and telling people they’re wrong is a direct challenge. By asking for more information you open up a conversation about the thinking process involved (assuming their was one! 🙂 ).

The important thing is to work with Fred on the problem, so that he’s receptive to change. If you work on Fred as the problem, he’ll resist.

Pro-tip – make sure the open question you use isn’t “Why?”. That’s pretty much always taken as a challenge. Compare the question above with “Why did you pick those colours for the slides?”.

If someone said that about your slides you’d automatically assume they thought the the choice was a bad one, wouldn’t you?

Oh, and don’t try to provide feedback on more than one (or two) things at a time. Too much critisism makes people feel like they’re being battered by a heavy weight – and they’re less likely to take things on board.

men at work warning sign

… and once you’ve got Fred talking about his processes, you can follow on with a hidden suggestion. Try something like “Oh, cool. I wondered if it was something like that. Have you come across the colour advice at XYZ?”

When Fred says no, you’re in the position of doing him a favour by giving him a tool to make his next presentation even better!

What about triaging the presentation?

Errrmmm… what’s triage, Simon? Triage is the act/art of splitting things into three bits:

  • this can’t be helped no matter what
  • this is on the borderline and can be helped with effort
  • this is okay and doesn’t need to be helped

Side note: triage is originally a medical term, looking at the order in which casualties are to be treated.

In terms of Fred From Finance’s presentation this boils down to making sure the feedback you give him is in the middle bit. Don’t pick on the colour scheme of slides if it’s so damned bad that nothing you can do will save it. Similarly don’t feedback on the volume of Fred’s voice if it was loud enough for everyone to hear. Instead, pick on something about the presentation that’s on the cusp of being good enough – something that, once you improve it – will make a clear difference to how well the presentation goes.

The idea is to pick something that even Fred can see was useful, so that the next presentation is better and which in turn means that the next round of feedback is easier to give.

smiley face

In short, pick your fights!

Think carefully about which bit of the presentation it’s worth giving feedback on and don’t just list everything that was wrong!

Have you ever been brutal, Simon?

desperate things to do in boring presentations - iPhone screenshot

Yes. That will come as no surprise, for long-time readers. I’ve walked out on public presenters because they were getting paid – but they were so bloody bad (as presenters, I’m sure they were lovely people) that they were wasting everyone’s time. That’s rare though. Normally I just find something else to do on my iPhone.

I semi-famously told someone who became a friend of mine “That was by far, the least crap presentation of today.” (If you’re interested, they held onto that line to use at a presentation of mine recently when I came off stage!)

The point is – and this is personal, not based on research… so ignore it if you want – that by not giving people some help, you’re actually doing them a disservice, along with everyone else in the audience.

On the other hand, if you’re on the receiving end of feedback, take a long hard look at whether your presentations will benefit from following it!

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Love it! This is always a tricky subject to approach in my line of work. So thanks!

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Hi Laura – I can imagine how tricky it is to give feedback on headshots and images. The phrase “What were you thinking?!?!” probably wouldn’t work too well! 🙂

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Fun topic for #SaySomethingNiceDay : )) I saw a presentation a while ago. I disagreed with something fundamental the person said. But I just swallowed it. Your advice has encouraged me to tackle this sort of thing in future (perhaps…)

That’s interesting Janine – when I wrote it I was thinking more of ‘bad’ presentations rather than things in what might be good presentations (or bad ones) that we disagree with. I guess the principles remain the same though!

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Good approaches here, Simon. It definitely sounds right to take the conciliatory/supportive approach rather than the “37 reasons why your presentation sucked ass (and why you’re even worse than that)” approach.

I’ve never heard of #SaySomethingNiceDay – what a world.

Hi John – to be honest, I’d not heard of it either until something arrived in my in-box. Nice that we’ve got such a day, but a shame that the world needs it!

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Thanks Simon. This could be applied to any feedback. Particularly like the triage idea.

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Blog > Effective Feedback for Presentations - digital with PowerPoint or with printable sheets

Effective Feedback for Presentations - digital with PowerPoint or with printable sheets

10.26.20   •  #powerpoint #feedback #presentation.

Do you know whether you are a good presenter or not? If you do, chances are it's because people have told you so - they've given you feedback. Getting other's opinions about your performance is something that's important for most aspects in life, especially professionally. However, today we're focusing on a specific aspect, which is (as you may have guessed from the title): presentations.

feedback-drawn-on-board

The importance of feedback

Take a minute to think about the first presentation you've given: what was it like? Was it perfect? Probably not. Practise makes perfect, and nobody does everything right in the beginning. Even if you're a natural at speaking and presenting, there is usually something to improve and to work on. And this is where feedback comes in - because how are you going to know what it is that you should improve? You can and should of course assess yourself after each and every presentation you give, as that is an important part of learning and improvement. The problem is that you yourself are not aware of all the things that you do well (or wrong) during your presentation. But your audience is! And that's why you should get audience feedback.

Qualities of good Feedback

Before we get into the different ways of how you can get feedback from your audience, let's briefly discuss what makes good feedback. P.S.: These do not just apply for presentations, but for any kind of feedback.

  • Good feedback is constructive, not destructive. The person receiving feedback should feel empowered and inspired to work on their skills, not discouraged. You can of course criticize on an objective level, but mean and insulting comments have to be kept to yourself.
  • Good feedback involves saying bot what has to be improved (if there is anything) and what is already good (there is almost always something!)
  • After receiving good feedback, the recipient is aware of the steps he can and should take in order to improve.

Ways of receiving / giving Feedback after a Presentation

1. print a feedback form.

feedback-form

Let's start with a classic: the feedback / evaluation sheet. It contains several questions, these can be either open (aka "What did you like about the presentation?") or answered on a scale (e.g. from "strongly disagree" to "strongly agree"). The second question format makes a lot of sense if you have a large audience, and it also makes it easy to get an overview of the results. That's why in our feedback forms (which you can download at the end of this post), you'll find mainly statements with scales. This has been a proven way for getting and giving valuable feedback efficiently for years. We do like the feedback form a lot, though you have to be aware that you'll need to invest some time to prepare, count up and analyse.

  • ask specifically what you want to ask
  • good overview of the results
  • anonymous (people are likely to be more honest)
  • easy to access: you can just download a feedback sheet online (ours, for example, which you'll find at the end of this blog post!)
  • analysing the results can be time-consuming
  • you have to print out the sheets, it takes preparation

2. Online: Get digital Feedback

get-online-feedback

In the year 2020, there's got to be a better way of giving feedback, right? There is, and you should definitely try it out! SlideLizard is a free PowerPoint extension that allows you to get your audience's feedback in the quickest and easiest way possible. You can of course customize the feedback question form to your specific needs and make sure you get exactly the kind of feedback you need. Click here to download SlideLizard right now, or scroll down to read some more about the tool.

  • quick and easy to access
  • easy and fast export, analysis and overview of feedback
  • save feedback directly on your computer
  • Participants need a working Internet connection (but that usually isn't a problem nowadays)

3. Verbal Feedback

verbal-feedback

"So, how did you like the presentation?", asks the lecturer. A few people in the audience nod friendly, one or two might even say something about how the slides were nice and the content interesting. Getting verbal feedback is hard, especially in big groups. If you really want to analyse and improve your presentation habits and skills, we recommend using one of the other methods. However, if you have no internet connection and forgot to bring your feedback sheets, asking for verbal feedback is still better than nothing.

  • no prerequisites
  • open format
  • okay for small audiences
  • not anonymous (people might not be honest)
  • time consuming
  • no detailed evaluation
  • no way to save the feedback (except for your memory)
  • not suitable for big audiences

Feedback to yourself - Self Assessment

feedback-for-yourself

I've mentioned before that it is incredibly important to not only let others tell you what went well and what didn't in your presentation. Your own impressions are of huge value, too. After each presentation you give, ask yourself the following questions (or better yet, write your answers down!):

  • What went wrong (in my opinion)? What can I do in order to avoid this from happening next time?
  • What went well? What was well received by the audience? What should I do more of?
  • How was I feeling during this presentation? (Nervous? Confident? ...)

Tip: If you really want to actively work on your presentation skills, filming yourself while presenting and analysing the video after is a great way to go. You'll get a different view on the way you talk, move, and come across.

comment for good presentation

Digital Feedback with SlideLizard

Were you intrigued by the idea of easy Online-feedback? With SlideLizard your attendees can easily give you feedback directly with their Smartphone. After the presentation you can analyze the result in detail.

  • type in your own feedback questions
  • choose your rating scale: 1-5 points, 1-6 points, 1-5 stars or 1-6 stars;
  • show your attendees an open text field and let them enter any text they want

feedback-with-slidelizard

Note: SlideLizard is amazing for giving and receiving feedback, but it's definitely not the only thing it's great for. Once you download the extension, you get access to the most amazing tools - most importantly, live polls and quizzes, live Q&A sessions, attendee note taking, content and slide sharing, and presentation analytics. And the best thing about all this? You can get it for free, and it is really easy to use, as it is directly integrated in PowerPoint! Click here to discover more about SlideLizard.

Free Download: Printable Feedback Sheets for Business or School Presentations

If you'd rather stick with the good old paper-and-pen method, that's okay, too. You can choose between one of our two feedback sheet templates: there is one tailored to business presentations and seminars, and one that is created specifically for teachers assessing their students. Both forms can be downloaded as a Word, Excel, or pdf file. A lot of thought has gone into both of the forms, so you can benefit as much as possible; however, if you feel like you need to change some questions in order to better suit your needs, feel free to do so!

Feedback form for business

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Template as PDF, Word & Excel - perfect for seminars, trainings,...

Feedback form for teachers (school or university)

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Template as PDF, Word & Excel - perfect for school or university,...

Where can I find a free feedback form for presentations?

There are many templates available online. We designed two exclusive, free-to-download feedback sheets, which you can get in our blog article

What's the best way to get feedback for presentations?

You can get feedback on your presentations by using feedback sheets, asking for feedback verbally, or, the easiest and fastest option: get digital feedback with an online tool

Related articles

About the author.

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Pia Lehner-Mittermaier

Pia works in Marketing as a graphic designer and writer at SlideLizard. She uses her vivid imagination and creativity to produce good content.

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.css-1qrtm5m{display:block;margin-bottom:8px;text-transform:uppercase;font-size:14px;line-height:1.5714285714285714;-webkit-letter-spacing:-0.35px;-moz-letter-spacing:-0.35px;-ms-letter-spacing:-0.35px;letter-spacing:-0.35px;font-weight:300;color:#606F7B;}@media (min-width:600px){.css-1qrtm5m{font-size:16px;line-height:1.625;-webkit-letter-spacing:-0.5px;-moz-letter-spacing:-0.5px;-ms-letter-spacing:-0.5px;letter-spacing:-0.5px;}} Best Practices Become a better presenter -- with a little help from your friends

by TED Masterclass Team • May 12, 2020

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Getting useful feedback can be a critical step in developing an effective presentation - it can also be harder to find than you might expect. Honest feedback calls on you to be vulnerable, and forces your feedback partner to sometimes deliver difficult constructive criticism. The good news is that this type of deep and authentic feedback can encourage personal growth and a willingness to take creative risks.

Get high-quality feedback that elevates your presentation skills by putting in a little extra preparation and focus.

First, decide who to ask for feedback

Feedback can feel personally risky if it’s coming from a close friend or colleague. Because these relationships are so important to us, honest feedback can end up feeling critical. In these situations, it can become tempting to give non-critical feedback, but that’s not helpful.

The person you work with to give you feedback should be someone:

  • You want to learn from, who pushes you to think creatively
  • With a different perspective - it can help to look beyond the people you spend a lot of time with personally or professionally
  • Who shares your enthusiasm for acquiring new skills and is excited for you to become a better presenter

Then, prepare to receive feedback

Just as important as deciding who will be giving you feedback, is creating an environment and mindset where giving and receiving constructive feedback is easy.

  • Create a distraction-free time and space for getting feedback. Ideally both of you should be present, focused, and open. If we’re feeling stressed or pressed for time, it’s hard to be a good feedback partner. That’s why it’s wise to tune in to how you’re feeling before you schedule a session.
  • Remind the person that you’re looking for honest feedback to be the best presenter you can be.
  • Before getting started, tell the person if there are any specific aspects of your idea or talk that you’d like them to focus feedback on.

Finally, ask the right questions

Giving feedback can be overwhelming for your partner if they don’t know what they should be focusing on. Decide on these areas ahead of time, and let your partner know. Then follow up with questions that will help them hone in on the most helpful feedback points for you.

Get overall feedback using these three questions:

  • What works?
  • What needs work?
  • What’s a suggestion for one thing I might try?

Get specific feedback using these questions:

  • Delivery: How is it landing for you overall? Are there places where your attention is wandering? What’s distracting?
  • Content: Do you get this - will the audience? What questions do you have? Where are you engaged? Surprised? Moved? Is there a clear takeaway for the audience? Do you have any clarifying questions?

Good feedback is a gift that can really elevate your presentation skills. Make the most of your feedback opportunities with a little preparation.

© 2024 TED Conferences, LLC. All rights reserved. Please note that the TED Talks Usage policy does not apply to this content and is not subject to our creative commons license.

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How to give feedback on a presentation

Knowing how to give feedback on a presentation helps people become better presenters, sharpens their message, and gauges audience engagement ahead of time.

December 7, 2022

How many times have you been asked to give feedback on a presentation, and, while trying to organize your thoughts after hearing the presentation in real-time, found it hard to muster anything more than, "It's good"?

Or, you've taken the time to give thoughtful, nuanced advice on how a colleague can improve their presentation, only to find that you don't know exactly how to communicate it, or they don't know exactly how to implement it?

Any kind of creative feedback is difficult to conceptualize without the proper context, and that's doubly true for presentations, where you're often asked to listen to the presentation, absorb the information it's conveying, process your thoughts, and deliver a critique — all in real time. No one can give good feedback that way, but it's not the presenter's fault (or yours!). You just need a better feedback process.

Giving better presentation feedback requires examining two things:

  • The feedback itself
  • How it's being given (and received)

Ready to learn how to improve them both? Let's get started.

Why it's important to give feedback on a presentation

Giving feedback on a presentation comes with several key benefits.

It promotes growth and builds better presentation skills

No one is born an effective presenter. It takes time, skill, and practice to build public speaking and communication skills to where you can knock a presentation out of the park — every time.

As the old adage goes, practice makes perfect. Giving practice presentations for feedback from trusted peers and colleagues gives you an opportunity to get more presenting time under your belt — with lower stakes.

And by giving effective, actionable feedback (more on that below) to a colleague, you help ensure their next presentation is even better, which can benefit your company or organization.

It helps sharpen the message

When it comes to getting the message exactly right in a presentation, self evaluation can really only go so far. Sometimes it takes another point of view (or several of them, from all across your organization) to collaborate and craft exactly what key points you want attendees to take away from a presentation. Giving feedback allows you to help refine and sharpen the message — and to work with others who are also giving feedback — until it's perfect.

It gauges audience engagement

One of the hardest things about giving a presentation is holding audience attention from the first slide until the last.

This is especially true for an oral presentation that doesn't have any audiovisual components. In this case, it's crucial to know if there are any points where audience members might be more prone to losing focus — like if your presentation gets a little too in the weeds.

Giving feedback allows you to put yourself in the audience's shoes. Try to see and hear the presentation from their perspective, and if there's any point where you feel your mind start to wander, make a note of it — that's a point where audience engagement may be at risk during the real thing.

All feedback is not created equal

It's important to note that not all feedback is good feedback.

Not all feedback provides a benefit to the person giving the presentation. It isn't all actionable. It isn't all relevant. It isn't all useful.

When feedback is bad, it's usually for one of two reasons.

The feedback itself is of poor quality

Even when you have the best of intentions, you might still give bad feedback.

Some examples of poor quality feedback include:

  • Feedback that's vague or unclear
  • Feedback that's overly personal or meant as an attack
  • Feedback that's dishonest, even if intended to spare the presenter's feelings

The feedback isn't communicated effectively

It's also possible to have useful feedback to give to a presenter, but to lack an effective system for communicating it. This can be especially challenging when there are multiple people trying to give feedback on one presentation at the same time. 

That's why bubbles is the best way to give feedback on a presentation. 

The presenter can record their speech, including a video of their screen to capture a Powerpoint presentation or any other visual aid they plan to use. Then, colleagues who are giving feedback can do so by leaving their comments at the exact, time-stamped moment where their feedback applies — and they can give their critique in text, audio, or video. Anyone can respond to a comment within a thread that captures (and preserves) all the context of the conversation so far. This makes it easier for a group to give feedback collaboratively, and makes it possible for the presenter to refer back to feedback at any time.

6 ways to give effective feedback on a presentation

Ready to give feedback that will turn a good presentation into a great one? The six tips below will help you give feedback that's effective and useful to the presenter, leaving them with clear takeaways they can use to level up their presentation. Let's get started.

Be specific

When giving feedback, try to be as specific as possible. Rather than saying something like, "I thought the presentation was effective," tell the presenter exactly what was effective. For example, a better piece of feedback is: "The key takeaway from the fifth slide was clear and really resonated with me." It tells the presenter exactly what you thought worked, rather than a vague, catch-all compliment.

If you're having trouble being more specific with your feedback (like if you aren't sure how to articulate your advice), sometimes an example can help! In your bubble comment, use a snippet of your own presentation (or even a Ted Talk or other professional speaking event) to more clearly illustrate what you're asking the presenter to do or change.

When you leave comments on the presenter's bubble, be sure to time-stamp them to the exact part of the presentation where the feedback applies. This can help ensure that the presenter gets the most value from your feedback, and can see what you mean in the proper context.

Be actionable

Even if your feedback is as specific as possible, it won't help the presenter if there's nothing they can do about it. That's why the next tip is to give feedback that's actionable — that is, don't just tell the presenter what they should change, but tell them what steps they can take to improve.

For example, don't just say someone needs to work on their body language while presenting. Tell them, as specifically as possible, how their body language could be improved; for example, if they should make more eye contact with audience members or gesture more with their hands while speaking.

You can even take this a step further and explain why you made this suggestion. For example, this feedback might be something like, "I would suggest making an effort to make eye contact with more members of the audience. This will engage more people and hold their attention, while helping your speech sound more natural."

Be constructive

In the same vein as giving actionable feedback is making sure you're giving constructive feedback — that is, that your feedback is about things the presenter can control and change.

Constructive criticism can be difficult to do well. It requires pointing out ways a presenter can improve — sometimes ways that can feel personal to them as they're on the receiving end of the feedback. But if the feedback is truly constructive, it's better to give it than to sugarcoat your critique to spare a presenter's feelings. And if hurting the presenter's feelings is the goal for the feedback, it's definitely not constructive.

Call out positives along with points of improvement

When giving feedback on a presentation, it can be easy to only focus on things you feel the presenter needs to improve. But it's just as important to give positive feedback that lets them know what they're doing well.

In fact, you might want to work even harder to find the positives than to point out places where the presenter can improve. In one study, conducted by academic Emily Heaphy and consultant Marcial Losada, team effectiveness was measured and compared with the ratio of positive and negative comments that team members made to one another. Heaphy and Losada found that in the most effective teams, the ratio was 5.6 — meaning those team members gave each other nearly six positive comments for every single negative one.

A study of team effectiveness and feedback found that high performing team membergave each other nearly six positive comments for every single negative one

Medium performing teams averaged 1.9 positive comments for each negative one. And low performing teams were more negative than positive, with a 0.36 ratio (nearly three negative comments for every positive one).

The research shows that, as tempting as it may be to only point out ways a presenter can improve, it may help them even more to find as many positives as possible to go along with your constructive criticism.

This is another tip where you have a balance to strike. You should give feedback to the presenter quickly, but not so quickly that you don't have time to absorb their presentation and process your thoughts, first.

Giving feedback in real-time (for example, in a review meeting) can seem effective, since it gives the presenter a way of receiving feedback instantly. However, giving instant feedback isn't always ideal for the colleagues who are critiquing the presentation, who might give more helpful feedback if they have more time to gather their thoughts.

When you use bubbles to give feedback on a presentation, it allows everyone on the team to give feedback at their own pace. It also allows people to watch the presentation more than once, or go back through certain sections they'd like to revisit before giving feedback.

It also eliminates the need to schedule a meeting to deliver presentation feedback. Even if the presenter and people giving feedback are separated by time zones , they can watch the presentation and deliver feedback at times that are convenient for them — and the presenter can access (and action) that feedback whenever they're back online.

Do a few rounds of feedback

As everyone gives their feedback, they can collaborate in comment threads in the bubble. This allows everyone to see what's been said already, including all the context and nuance of the discussion, keeping everyone on the same page. The presenter can follow up with comments, and those giving feedback can watch the presentation more than once to give a few rounds of feedback.

This helps ensure that feedback is as comprehensive as possible, and that the presenter and everyone critiquing their presentation is able to focus on any key messages that come out of the feedback rounds — what changes are most impactful? What will really take this presentation to the next level?

Make feedback more comprehensive and collaborative

Giving feedback on a presentation will be most effective when your entire team can work together, seamlessly, to give comprehensive feedback to the presenter. With bubbles, you can have that conversation together, with all the context necessary to craft the perfect presentation.

Get started today with bubbles' free Chrome extension and start working together, in context.

Make your meetings matter

Use AI to record, transcribe, and summarize meetings into actions. Bubbles is your home for after-meeting collaboration.

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Collaborate better with your team

Get your point across using screen, video, and audio messages. Bubbles is free, and offers unlimited recordings with a click of a button.

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What It Takes to Give a Great Presentation

  • Carmine Gallo

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Five tips to set yourself apart.

Never underestimate the power of great communication. It can help you land the job of your dreams, attract investors to back your idea, or elevate your stature within your organization. But while there are plenty of good speakers in the world, you can set yourself apart out by being the person who can deliver something great over and over. Here are a few tips for business professionals who want to move from being good speakers to great ones: be concise (the fewer words, the better); never use bullet points (photos and images paired together are more memorable); don’t underestimate the power of your voice (raise and lower it for emphasis); give your audience something extra (unexpected moments will grab their attention); rehearse (the best speakers are the best because they practice — a lot).

I was sitting across the table from a Silicon Valley CEO who had pioneered a technology that touches many of our lives — the flash memory that stores data on smartphones, digital cameras, and computers. He was a frequent guest on CNBC and had been delivering business presentations for at least 20 years before we met. And yet, the CEO wanted to sharpen his public speaking skills.

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  • Carmine Gallo is a Harvard University instructor, keynote speaker, and author of 10 books translated into 40 languages. Gallo is the author of The Bezos Blueprint: Communication Secrets of the World’s Greatest Salesman  (St. Martin’s Press).

Partner Center

Compliment or Praise a Speaker • Example Letters, Guides and Samples

A speaker at a seminar, symposium, conference, meeting, or convention deserves your special compliments and praise if you benefited from his or her efforts. The speaker may wonder how the audience received the speech. A brief, sincere note with positive feedback will always be appreciated.

How to write this compliment letter:

  • Tell the speaker that you enjoyed his or her speech.
  • Mention specifically what you liked about the speech or presentation and, if appropriate, explain how you have personally benefited from the speech.
  • Conclude by thanking the speaker.

Example Letter #1

I thoroughly enjoyed your presentation yesterday evening. Your delivery was so engaging that I lost all track of time. By any measure you are a very effective speaker and educator. I found your comments regarding future computers especially intriguing. On behalf of the Doe Corporation, thank you for a memorable presentation and hope you will visit us again.

Example Letter #2

We want to tell you how much we enjoyed your presentation to our study group last Friday. We have been reading a lot about the history of our state, and your illustrated talk made it all come alive for us. Those of us who have ancestors who settled this region were especially grateful for your discussion their contributions. It was thoughtful of you to add those personal observations. Your talk also gave a great boost to our efforts to recruit additional members. Thank you very much for an enlightening and stimulating presentation.

Example Letter #3

Congratulations on the speech you gave at the annual symposium last Friday. The topic was timely, and you presented the material on the new innovations in a way that everyone could understand. I personally feel much more confident working with the new system now than I did before your presentation. Thank you for a very valuable experience.

Write Your Letter Step-by-Step

1 Tell the speaker that you enjoyed his or her speech.

Sample Sentences for Step 1

  • I enjoyed the lecture you gave at Doe University last Tuesday.
  • I appreciated the speech you gave yesterday.
  • I want to compliment you on your speech. It was very relevant to our current debates on funding local education.
  • I am very grateful you took the time out of your busy schedule to address our small group.
  • You gave a terrific presentation at this year's Doe symposium.
  • We were all pleased with your topic for Saturday's lecture.
  • Your comments the other evening were exactly what I needed to hear.
  • Your discussion-group presentation was the highlight of the conference.

Sample Phrases for Step 1

  • a most valuable addition to
  • am glad that I attended your
  • appreciate the time you gave
  • express my appreciation for
  • feel fortunate to have
  • how much I appreciated
  • the highlight of
  • thoroughly enjoyed the
  • want to compliment you on
  • want you to know
  • was a great success
  • was a pleasure to listen to
  • was most stimulating
  • was one of the finest
  • were enthralled by
  • were so impressed with
  • were very pleased with
  • wish to express my appreciation for
  • your fascinating presentation on
  • your presentation was
  • your insightful presentation

2 Mention specifically what you liked about the speech or presentation and, if appropriate, explain how you have personally benefited from the speech.

Sample Sentences for Step 2

  • It was the best lecture of the year. You were witty and very informative.
  • You maintained remarkable poise in the face of a potentially hostile audience.
  • As usual, your speech brought new insights from current research. Your talks always motivate our staff to stick with their work.
  • Your presentation drew the audience in and held their attention for two full hours. There was never a dull moment.
  • I was glad you reserved a few minutes to field questions. Your answers were very insightful.
  • It was a pleasure to hear your humorous stories.
  • Your remarks triggered new ideas that will benefit our corporation for years to come.
  • You helped kindle a renewed enthusiasm for my profession.
  • I plan to implement some of your ideas with my own clientele.
  • You gave me a new sense of pride in my career.
  • We have already begun to implement some of your suggestions and are confident they will improve our manufacturing process.
  • Since we have just purchased a new home, your remarks about personal money management were especially helpful.
  • After listening to your report on the situation in Third World countries, I knew I had chosen the right course of study.

Sample Phrases for Step 2

  • both the style and the substance of your
  • both witty and informative
  • brought new insights
  • came alive for me
  • clear, factual analysis
  • delightfully entertaining
  • gave rise to ongoing discussion
  • gave me a new sense of
  • have already taken steps to
  • heartily agree with you that
  • hit the nail on the head
  • imaginative presentation of
  • intelligent, well thought-out solutions to
  • particularly appreciated your
  • plan to implement your
  • put some of your ideas into practice
  • rekindled an enthusiasm for
  • triggered new ideas
  • used humor to make your point
  • valuable information you gave
  • were especially helpful
  • will certainly help me in
  • your in-depth knowledge of
  • your original approach to

3 Conclude by thanking the speaker.

Sample Sentences for Step 3

  • Thank you for your helpful comments.
  • Thank you for your enlightening speech.
  • I appreciated your lecture and felt as if you were speaking directly to me.
  • Please accept our thanks for a great presentation
  • Thank you for speaking to us this week.
  • We thank you for your stimulating speech.

Sample Phrases for Step 3

  • accept our thanks for
  • am grateful for
  • best wishes for
  • for an outstanding
  • for all the
  • for your time and effort
  • for adding so much to our
  • for speaking at our
  • giving us such a worthwhile
  • hope you will be able to
  • it was our privilege to
  • look forward to
  • on behalf of
  • such an excellent
  • thank you once again for
  • thank you for
  • will be sure to
  • wish you continued success
  • your most helpful

Recommended Letter-Writing Resources

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Action Verbs for Resumes and Cover Letters

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Business Letter Format Tips

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Letter Closings

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Blog Beginner Guides

How To Make a Good Presentation [A Complete Guide]

By Krystle Wong , Jul 20, 2023

How to make a good presentation

A top-notch presentation possesses the power to drive action. From winning stakeholders over and conveying a powerful message to securing funding — your secret weapon lies within the realm of creating an effective presentation .  

Being an excellent presenter isn’t confined to the boardroom. Whether you’re delivering a presentation at work, pursuing an academic career, involved in a non-profit organization or even a student, nailing the presentation game is a game-changer.

In this article, I’ll cover the top qualities of compelling presentations and walk you through a step-by-step guide on how to give a good presentation. Here’s a little tip to kick things off: for a headstart, check out Venngage’s collection of free presentation templates . They are fully customizable, and the best part is you don’t need professional design skills to make them shine!

These valuable presentation tips cater to individuals from diverse professional backgrounds, encompassing business professionals, sales and marketing teams, educators, trainers, students, researchers, non-profit organizations, public speakers and presenters. 

No matter your field or role, these tips for presenting will equip you with the skills to deliver effective presentations that leave a lasting impression on any audience.

Click to jump ahead:

What are the 10 qualities of a good presentation?

Step-by-step guide on how to prepare an effective presentation, 9 effective techniques to deliver a memorable presentation, faqs on making a good presentation, how to create a presentation with venngage in 5 steps.

When it comes to giving an engaging presentation that leaves a lasting impression, it’s not just about the content — it’s also about how you deliver it. Wondering what makes a good presentation? Well, the best presentations I’ve seen consistently exhibit these 10 qualities:

1. Clear structure

No one likes to get lost in a maze of information. Organize your thoughts into a logical flow, complete with an introduction, main points and a solid conclusion. A structured presentation helps your audience follow along effortlessly, leaving them with a sense of satisfaction at the end.

Regardless of your presentation style , a quality presentation starts with a clear roadmap. Browse through Venngage’s template library and select a presentation template that aligns with your content and presentation goals. Here’s a good presentation example template with a logical layout that includes sections for the introduction, main points, supporting information and a conclusion: 

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2. Engaging opening

Hook your audience right from the start with an attention-grabbing statement, a fascinating question or maybe even a captivating anecdote. Set the stage for a killer presentation!

The opening moments of your presentation hold immense power – check out these 15 ways to start a presentation to set the stage and captivate your audience.

3. Relevant content

Make sure your content aligns with their interests and needs. Your audience is there for a reason, and that’s to get valuable insights. Avoid fluff and get straight to the point, your audience will be genuinely excited.

4. Effective visual aids

Picture this: a slide with walls of text and tiny charts, yawn! Visual aids should be just that—aiding your presentation. Opt for clear and visually appealing slides, engaging images and informative charts that add value and help reinforce your message.

With Venngage, visualizing data takes no effort at all. You can import data from CSV or Google Sheets seamlessly and create stunning charts, graphs and icon stories effortlessly to showcase your data in a captivating and impactful way.

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5. Clear and concise communication

Keep your language simple, and avoid jargon or complicated terms. Communicate your ideas clearly, so your audience can easily grasp and retain the information being conveyed. This can prevent confusion and enhance the overall effectiveness of the message. 

6. Engaging delivery

Spice up your presentation with a sprinkle of enthusiasm! Maintain eye contact, use expressive gestures and vary your tone of voice to keep your audience glued to the edge of their seats. A touch of charisma goes a long way!

7. Interaction and audience engagement

Turn your presentation into an interactive experience — encourage questions, foster discussions and maybe even throw in a fun activity. Engaged audiences are more likely to remember and embrace your message.

Transform your slides into an interactive presentation with Venngage’s dynamic features like pop-ups, clickable icons and animated elements. Engage your audience with interactive content that lets them explore and interact with your presentation for a truly immersive experience.

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8. Effective storytelling

Who doesn’t love a good story? Weaving relevant anecdotes, case studies or even a personal story into your presentation can captivate your audience and create a lasting impact. Stories build connections and make your message memorable.

A great presentation background is also essential as it sets the tone, creates visual interest and reinforces your message. Enhance the overall aesthetics of your presentation with these 15 presentation background examples and captivate your audience’s attention.

9. Well-timed pacing

Pace your presentation thoughtfully with well-designed presentation slides, neither rushing through nor dragging it out. Respect your audience’s time and ensure you cover all the essential points without losing their interest.

10. Strong conclusion

Last impressions linger! Summarize your main points and leave your audience with a clear takeaway. End your presentation with a bang , a call to action or an inspiring thought that resonates long after the conclusion.

In-person presentations aside, acing a virtual presentation is of paramount importance in today’s digital world. Check out this guide to learn how you can adapt your in-person presentations into virtual presentations . 

Peloton Pitch Deck - Conclusion

Preparing an effective presentation starts with laying a strong foundation that goes beyond just creating slides and notes. One of the quickest and best ways to make a presentation would be with the help of a good presentation software . 

Otherwise, let me walk you to how to prepare for a presentation step by step and unlock the secrets of crafting a professional presentation that sets you apart.

1. Understand the audience and their needs

Before you dive into preparing your masterpiece, take a moment to get to know your target audience. Tailor your presentation to meet their needs and expectations , and you’ll have them hooked from the start!

2. Conduct thorough research on the topic

Time to hit the books (or the internet)! Don’t skimp on the research with your presentation materials — dive deep into the subject matter and gather valuable insights . The more you know, the more confident you’ll feel in delivering your presentation.

3. Organize the content with a clear structure

No one wants to stumble through a chaotic mess of information. Outline your presentation with a clear and logical flow. Start with a captivating introduction, follow up with main points that build on each other and wrap it up with a powerful conclusion that leaves a lasting impression.

Delivering an effective business presentation hinges on captivating your audience, and Venngage’s professionally designed business presentation templates are tailor-made for this purpose. With thoughtfully structured layouts, these templates enhance your message’s clarity and coherence, ensuring a memorable and engaging experience for your audience members.

Don’t want to build your presentation layout from scratch? pick from these 5 foolproof presentation layout ideas that won’t go wrong. 

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4. Develop visually appealing and supportive visual aids

Spice up your presentation with eye-catching visuals! Create slides that complement your message, not overshadow it. Remember, a picture is worth a thousand words, but that doesn’t mean you need to overload your slides with text.

Well-chosen designs create a cohesive and professional look, capturing your audience’s attention and enhancing the overall effectiveness of your message. Here’s a list of carefully curated PowerPoint presentation templates and great background graphics that will significantly influence the visual appeal and engagement of your presentation.

5. Practice, practice and practice

Practice makes perfect — rehearse your presentation and arrive early to your presentation to help overcome stage fright. Familiarity with your material will boost your presentation skills and help you handle curveballs with ease.

6. Seek feedback and make necessary adjustments

Don’t be afraid to ask for help and seek feedback from friends and colleagues. Constructive criticism can help you identify blind spots and fine-tune your presentation to perfection.

With Venngage’s real-time collaboration feature , receiving feedback and editing your presentation is a seamless process. Group members can access and work on the presentation simultaneously and edit content side by side in real-time. Changes will be reflected immediately to the entire team, promoting seamless teamwork.

Venngage Real Time Collaboration

7. Prepare for potential technical or logistical issues

Prepare for the unexpected by checking your equipment, internet connection and any other potential hiccups. If you’re worried that you’ll miss out on any important points, you could always have note cards prepared. Remember to remain focused and rehearse potential answers to anticipated questions.

8. Fine-tune and polish your presentation

As the big day approaches, give your presentation one last shine. Review your talking points, practice how to present a presentation and make any final tweaks. Deep breaths — you’re on the brink of delivering a successful presentation!

In competitive environments, persuasive presentations set individuals and organizations apart. To brush up on your presentation skills, read these guides on how to make a persuasive presentation and tips to presenting effectively . 

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Whether you’re an experienced presenter or a novice, the right techniques will let your presentation skills soar to new heights!

From public speaking hacks to interactive elements and storytelling prowess, these 9 effective presentation techniques will empower you to leave a lasting impression on your audience and make your presentations unforgettable.

1. Confidence and positive body language

Positive body language instantly captivates your audience, making them believe in your message as much as you do. Strengthen your stage presence and own that stage like it’s your second home! Stand tall, shoulders back and exude confidence. 

2. Eye contact with the audience

Break down that invisible barrier and connect with your audience through their eyes. Maintaining eye contact when giving a presentation builds trust and shows that you’re present and engaged with them.

3. Effective use of hand gestures and movement

A little movement goes a long way! Emphasize key points with purposeful gestures and don’t be afraid to walk around the stage. Your energy will be contagious!

4. Utilize storytelling techniques

Weave the magic of storytelling into your presentation. Share relatable anecdotes, inspiring success stories or even personal experiences that tug at the heartstrings of your audience. Adjust your pitch, pace and volume to match the emotions and intensity of the story. Varying your speaking voice adds depth and enhances your stage presence.

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5. Incorporate multimedia elements

Spice up your presentation with a dash of visual pizzazz! Use slides, images and video clips to add depth and clarity to your message. Just remember, less is more—don’t overwhelm them with information overload. 

Turn your presentations into an interactive party! Involve your audience with questions, polls or group activities. When they actively participate, they become invested in your presentation’s success. Bring your design to life with animated elements. Venngage allows you to apply animations to icons, images and text to create dynamic and engaging visual content.

6. Utilize humor strategically

Laughter is the best medicine—and a fantastic presentation enhancer! A well-placed joke or lighthearted moment can break the ice and create a warm atmosphere , making your audience more receptive to your message.

7. Practice active listening and respond to feedback

Be attentive to your audience’s reactions and feedback. If they have questions or concerns, address them with genuine interest and respect. Your responsiveness builds rapport and shows that you genuinely care about their experience.

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8. Apply the 10-20-30 rule

Apply the 10-20-30 presentation rule and keep it short, sweet and impactful! Stick to ten slides, deliver your presentation within 20 minutes and use a 30-point font to ensure clarity and focus. Less is more, and your audience will thank you for it!

9. Implement the 5-5-5 rule

Simplicity is key. Limit each slide to five bullet points, with only five words per bullet point and allow each slide to remain visible for about five seconds. This rule keeps your presentation concise and prevents information overload.

Simple presentations are more engaging because they are easier to follow. Summarize your presentations and keep them simple with Venngage’s gallery of simple presentation templates and ensure that your message is delivered effectively across your audience.

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1. How to start a presentation?

To kick off your presentation effectively, begin with an attention-grabbing statement or a powerful quote. Introduce yourself, establish credibility and clearly state the purpose and relevance of your presentation.

2. How to end a presentation?

For a strong conclusion, summarize your talking points and key takeaways. End with a compelling call to action or a thought-provoking question and remember to thank your audience and invite any final questions or interactions.

3. How to make a presentation interactive?

To make your presentation interactive, encourage questions and discussion throughout your talk. Utilize multimedia elements like videos or images and consider including polls, quizzes or group activities to actively involve your audience.

In need of inspiration for your next presentation? I’ve got your back! Pick from these 120+ presentation ideas, topics and examples to get started. 

Creating a stunning presentation with Venngage is a breeze with our user-friendly drag-and-drop editor and professionally designed templates for all your communication needs. 

Here’s how to make a presentation in just 5 simple steps with the help of Venngage:

Step 1: Sign up for Venngage for free using your email, Gmail or Facebook account or simply log in to access your account. 

Step 2: Pick a design from our selection of free presentation templates (they’re all created by our expert in-house designers).

Step 3: Make the template your own by customizing it to fit your content and branding. With Venngage’s intuitive drag-and-drop editor, you can easily modify text, change colors and adjust the layout to create a unique and eye-catching design.

Step 4: Elevate your presentation by incorporating captivating visuals. You can upload your images or choose from Venngage’s vast library of high-quality photos, icons and illustrations. 

Step 5: Upgrade to a premium or business account to export your presentation in PDF and print it for in-person presentations or share it digitally for free!

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How can you make a good presentation even more effective?

This page draws on published advice from expert presenters around the world, which will help to take your presentations from merely ‘good’ to ‘great’.

By bringing together advice from a wide range of people, the aim is to cover a whole range of areas.

Whether you are an experienced presenter, or just starting out, there should be ideas here to help you to improve.

1. Show your Passion and Connect with your Audience

It’s hard to be relaxed and be yourself when you’re nervous.

But time and again, the great presenters say that the most important thing is to connect with your audience, and the best way to do that is to let your passion for the subject shine through.

Be honest with the audience about what is important to you and why it matters.

Be enthusiastic and honest, and the audience will respond.

2. Focus on your Audience’s Needs

Your presentation needs to be built around what your audience is going to get out of the presentation.

As you prepare the presentation, you always need to bear in mind what the audience needs and wants to know, not what you can tell them.

While you’re giving the presentation, you also need to remain focused on your audience’s response, and react to that.

You need to make it easy for your audience to understand and respond.

3. Keep it Simple: Concentrate on your Core Message

When planning your presentation, you should always keep in mind the question:

What is the key message (or three key points) for my audience to take away?

You should be able to communicate that key message very briefly.

Some experts recommend a 30-second ‘elevator summary’, others that you can write it on the back of a business card, or say it in no more than 15 words.

Whichever rule you choose, the important thing is to keep your core message focused and brief.

And if what you are planning to say doesn’t contribute to that core message, don’t say it.

4. Smile and Make Eye Contact with your Audience

This sounds very easy, but a surprisingly large number of presenters fail to do it.

If you smile and make eye contact, you are building rapport , which helps the audience to connect with you and your subject. It also helps you to feel less nervous, because you are talking to individuals, not to a great mass of unknown people.

To help you with this, make sure that you don’t turn down all the lights so that only the slide screen is visible. Your audience needs to see you as well as your slides.

5. Start Strongly

The beginning of your presentation is crucial. You need to grab your audience’s attention and hold it.

They will give you a few minutes’ grace in which to entertain them, before they start to switch off if you’re dull. So don’t waste that on explaining who you are. Start by entertaining them.

Try a story (see tip 7 below), or an attention-grabbing (but useful) image on a slide.

6. Remember the 10-20-30 Rule for Slideshows

This is a tip from Guy Kawasaki of Apple. He suggests that slideshows should:

  • Contain no more than 10 slides;
  • Last no more than 20 minutes; and
  • Use a font size of no less than 30 point.

This last is particularly important as it stops you trying to put too much information on any one slide. This whole approach avoids the dreaded ‘Death by PowerPoint’.

As a general rule, slides should be the sideshow to you, the presenter. A good set of slides should be no use without the presenter, and they should definitely contain less, rather than more, information, expressed simply.

If you need to provide more information, create a bespoke handout and give it out after your presentation.

7. Tell Stories

Human beings are programmed to respond to stories.

Stories help us to pay attention, and also to remember things. If you can use stories in your presentation, your audience is more likely to engage and to remember your points afterwards. It is a good idea to start with a story, but there is a wider point too: you need your presentation to act like a story.

Think about what story you are trying to tell your audience, and create your presentation to tell it.

Finding The Story Behind Your Presentation

To effectively tell a story, focus on using at least one of the two most basic storytelling mechanics in your presentation:

Focusing On Characters – People have stories; things, data, and objects do not. So ask yourself “who” is directly involved in your topic that you can use as the focal point of your story.

For example, instead of talking about cars (your company’s products), you could focus on specific characters like:

  • The drivers the car is intended for – people looking for speed and adventure
  • The engineers who went out of their way to design the most cost-effective car imaginable

A Changing Dynamic – A story needs something to change along the way. So ask yourself “What is not as it should be?” and answer with what you are going to do about it (or what you did about it).

For example…

  • Did hazardous road conditions inspire you to build a rugged, all-terrain jeep that any family could afford?
  • Did a complicated and confusing food labelling system lead you to establish a colour-coded nutritional index so that anybody could easily understand it?

To see 15 more actionable storytelling tips, see Nuts & Bolts Speed Training’s post on Storytelling Tips .

8. Use your Voice Effectively

The spoken word is actually a pretty inefficient means of communication, because it uses only one of your audience’s five senses. That’s why presenters tend to use visual aids, too. But you can help to make the spoken word better by using your voice effectively.

Varying the speed at which you talk, and emphasising changes in pitch and tone all help to make your voice more interesting and hold your audience’s attention.

For more about this, see our page on Effective Speaking .

9. Use your Body Too

It has been estimated that more than three quarters of communication is non-verbal.

That means that as well as your tone of voice, your body language is crucial to getting your message across. Make sure that you are giving the right messages: body language to avoid includes crossed arms, hands held behind your back or in your pockets, and pacing the stage.

Make your gestures open and confident, and move naturally around the stage, and among the audience too, if possible.

10. Relax, Breathe and Enjoy

If you find presenting difficult, it can be hard to be calm and relaxed about doing it.

One option is to start by concentrating on your breathing. Slow it down, and make sure that you’re breathing fully. Make sure that you continue to pause for breath occasionally during your presentation too.

For more ideas, see our page on Coping with Presentation Nerves .

If you can bring yourself to relax, you will almost certainly present better. If you can actually start to enjoy yourself, your audience will respond to that, and engage better. Your presentations will improve exponentially, and so will your confidence. It’s well worth a try.

Improve your Presentation Skills

Follow our guide to boost your presentation skills learning about preparation, delivery, questions and all other aspects of giving effective presentations.

Start with: What is a Presentation?

Continue to: How to Give a Speech Self Presentation

See also: Five Ways You Can Do Visual Marketing on a Budget Can Presentation Science Improve Your Presentation? Typography – It’s All About the Message in Your Slides

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There is unequivocal evidence that Earth is warming at an unprecedented rate. Human activity is the principal cause.

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  • While Earth’s climate has changed throughout its history , the current warming is happening at a rate not seen in the past 10,000 years.
  • According to the Intergovernmental Panel on Climate Change ( IPCC ), "Since systematic scientific assessments began in the 1970s, the influence of human activity on the warming of the climate system has evolved from theory to established fact." 1
  • Scientific information taken from natural sources (such as ice cores, rocks, and tree rings) and from modern equipment (like satellites and instruments) all show the signs of a changing climate.
  • From global temperature rise to melting ice sheets, the evidence of a warming planet abounds.

The rate of change since the mid-20th century is unprecedented over millennia.

Earth's climate has changed throughout history. Just in the last 800,000 years, there have been eight cycles of ice ages and warmer periods, with the end of the last ice age about 11,700 years ago marking the beginning of the modern climate era — and of human civilization. Most of these climate changes are attributed to very small variations in Earth’s orbit that change the amount of solar energy our planet receives.

CO2_graph

The current warming trend is different because it is clearly the result of human activities since the mid-1800s, and is proceeding at a rate not seen over many recent millennia. 1 It is undeniable that human activities have produced the atmospheric gases that have trapped more of the Sun’s energy in the Earth system. This extra energy has warmed the atmosphere, ocean, and land, and widespread and rapid changes in the atmosphere, ocean, cryosphere, and biosphere have occurred.

Earth-orbiting satellites and new technologies have helped scientists see the big picture, collecting many different types of information about our planet and its climate all over the world. These data, collected over many years, reveal the signs and patterns of a changing climate.

Scientists demonstrated the heat-trapping nature of carbon dioxide and other gases in the mid-19th century. 2 Many of the science instruments NASA uses to study our climate focus on how these gases affect the movement of infrared radiation through the atmosphere. From the measured impacts of increases in these gases, there is no question that increased greenhouse gas levels warm Earth in response.

Scientific evidence for warming of the climate system is unequivocal.

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Intergovernmental Panel on Climate Change

Ice cores drawn from Greenland, Antarctica, and tropical mountain glaciers show that Earth’s climate responds to changes in greenhouse gas levels. Ancient evidence can also be found in tree rings, ocean sediments, coral reefs, and layers of sedimentary rocks. This ancient, or paleoclimate, evidence reveals that current warming is occurring roughly 10 times faster than the average rate of warming after an ice age. Carbon dioxide from human activities is increasing about 250 times faster than it did from natural sources after the last Ice Age. 3

The Evidence for Rapid Climate Change Is Compelling:

Sunlight over a desert-like landscape.

Global Temperature Is Rising

The planet's average surface temperature has risen about 2 degrees Fahrenheit (1 degrees Celsius) since the late 19th century, a change driven largely by increased carbon dioxide emissions into the atmosphere and other human activities. 4 Most of the warming occurred in the past 40 years, with the seven most recent years being the warmest. The years 2016 and 2020 are tied for the warmest year on record. 5 Image credit: Ashwin Kumar, Creative Commons Attribution-Share Alike 2.0 Generic.

Colonies of “blade fire coral” that have lost their symbiotic algae, or “bleached,” on a reef off of Islamorada, Florida.

The Ocean Is Getting Warmer

The ocean has absorbed much of this increased heat, with the top 100 meters (about 328 feet) of ocean showing warming of 0.67 degrees Fahrenheit (0.33 degrees Celsius) since 1969. 6 Earth stores 90% of the extra energy in the ocean. Image credit: Kelsey Roberts/USGS

Aerial view of ice sheets.

The Ice Sheets Are Shrinking

The Greenland and Antarctic ice sheets have decreased in mass. Data from NASA's Gravity Recovery and Climate Experiment show Greenland lost an average of 279 billion tons of ice per year between 1993 and 2019, while Antarctica lost about 148 billion tons of ice per year. 7 Image: The Antarctic Peninsula, Credit: NASA

Glacier on a mountain.

Glaciers Are Retreating

Glaciers are retreating almost everywhere around the world — including in the Alps, Himalayas, Andes, Rockies, Alaska, and Africa. 8 Image: Miles Glacier, Alaska Image credit: NASA

Image of snow from plane

Snow Cover Is Decreasing

Satellite observations reveal that the amount of spring snow cover in the Northern Hemisphere has decreased over the past five decades and the snow is melting earlier. 9 Image credit: NASA/JPL-Caltech

Norfolk flooding

Sea Level Is Rising

Global sea level rose about 8 inches (20 centimeters) in the last century. The rate in the last two decades, however, is nearly double that of the last century and accelerating slightly every year. 10 Image credit: U.S. Army Corps of Engineers Norfolk District

Arctic sea ice.

Arctic Sea Ice Is Declining

Both the extent and thickness of Arctic sea ice has declined rapidly over the last several decades. 11 Credit: NASA's Scientific Visualization Studio

Flooding in a European city.

Extreme Events Are Increasing in Frequency

The number of record high temperature events in the United States has been increasing, while the number of record low temperature events has been decreasing, since 1950. The U.S. has also witnessed increasing numbers of intense rainfall events. 12 Image credit: Régine Fabri,  CC BY-SA 4.0 , via Wikimedia Commons

Unhealthy coral.

Ocean Acidification Is Increasing

Since the beginning of the Industrial Revolution, the acidity of surface ocean waters has increased by about 30%. 13 , 14 This increase is due to humans emitting more carbon dioxide into the atmosphere and hence more being absorbed into the ocean. The ocean has absorbed between 20% and 30% of total anthropogenic carbon dioxide emissions in recent decades (7.2 to 10.8 billion metric tons per year). 1 5 , 16 Image credit: NOAA

1. IPCC Sixth Assessment Report, WGI, Technical Summary . B.D. Santer et.al., “A search for human influences on the thermal structure of the atmosphere.” Nature 382 (04 July 1996): 39-46. https://doi.org/10.1038/382039a0. Gabriele C. Hegerl et al., “Detecting Greenhouse-Gas-Induced Climate Change with an Optimal Fingerprint Method.” Journal of Climate 9 (October 1996): 2281-2306. https://doi.org/10.1175/1520-0442(1996)009<2281:DGGICC>2.0.CO;2. V. Ramaswamy, et al., “Anthropogenic and Natural Influences in the Evolution of Lower Stratospheric Cooling.” Science 311 (24 February 2006): 1138-1141. https://doi.org/10.1126/science.1122587. B.D. Santer et al., “Contributions of Anthropogenic and Natural Forcing to Recent Tropopause Height Changes.” Science 301 (25 July 2003): 479-483. https://doi.org/10.1126/science.1084123. T. Westerhold et al., "An astronomically dated record of Earth’s climate and its predictability over the last 66 million years." Science 369 (11 Sept. 2020): 1383-1387. https://doi.org/10.1126/science.1094123

2. In 1824, Joseph Fourier calculated that an Earth-sized planet, at our distance from the Sun, ought to be much colder. He suggested something in the atmosphere must be acting like an insulating blanket. In 1856, Eunice Foote discovered that blanket, showing that carbon dioxide and water vapor in Earth's atmosphere trap escaping infrared (heat) radiation. In the 1860s, physicist John Tyndall recognized Earth's natural greenhouse effect and suggested that slight changes in the atmospheric composition could bring about climatic variations. In 1896, a seminal paper by Swedish scientist Svante Arrhenius first predicted that changes in atmospheric carbon dioxide levels could substantially alter the surface temperature through the greenhouse effect. In 1938, Guy Callendar connected carbon dioxide increases in Earth’s atmosphere to global warming. In 1941, Milutin Milankovic linked ice ages to Earth’s orbital characteristics. Gilbert Plass formulated the Carbon Dioxide Theory of Climate Change in 1956.

3. IPCC Sixth Assessment Report, WG1, Chapter 2 Vostok ice core data; NOAA Mauna Loa CO2 record O. Gaffney, W. Steffen, "The Anthropocene Equation." The Anthropocene Review 4, issue 1 (April 2017): 53-61. https://doi.org/abs/10.1177/2053019616688022.

4. https://www.ncei.noaa.gov/monitoring https://crudata.uea.ac.uk/cru/data/temperature/ http://data.giss.nasa.gov/gistemp

5. https://www.giss.nasa.gov/research/news/20170118/

6. S. Levitus, J. Antonov, T. Boyer, O Baranova, H. Garcia, R. Locarnini, A. Mishonov, J. Reagan, D. Seidov, E. Yarosh, M. Zweng, " NCEI ocean heat content, temperature anomalies, salinity anomalies, thermosteric sea level anomalies, halosteric sea level anomalies, and total steric sea level anomalies from 1955 to present calculated from in situ oceanographic subsurface profile data (NCEI Accession 0164586), Version 4.4. (2017) NOAA National Centers for Environmental Information. https://www.nodc.noaa.gov/OC5/3M_HEAT_CONTENT/index3.html K. von Schuckmann, L. Cheng, L,. D. Palmer, J. Hansen, C. Tassone, V. Aich, S. Adusumilli, H. Beltrami, H., T. Boyer, F. Cuesta-Valero, D. Desbruyeres, C. Domingues, A. Garcia-Garcia, P. Gentine, J. Gilson, M. Gorfer, L. Haimberger, M. Ishii, M., G. Johnson, R. Killick, B. King, G. Kirchengast, N. Kolodziejczyk, J. Lyman, B. Marzeion, M. Mayer, M. Monier, D. Monselesan, S. Purkey, D. Roemmich, A. Schweiger, S. Seneviratne, A. Shepherd, D. Slater, A. Steiner, F. Straneo, M.L. Timmermans, S. Wijffels. "Heat stored in the Earth system: where does the energy go?" Earth System Science Data 12, Issue 3 (07 September 2020): 2013-2041. https://doi.org/10.5194/essd-12-2013-2020.

7. I. Velicogna, Yara Mohajerani, A. Geruo, F. Landerer, J. Mouginot, B. Noel, E. Rignot, T. Sutterly, M. van den Broeke, M. Wessem, D. Wiese, "Continuity of Ice Sheet Mass Loss in Greenland and Antarctica From the GRACE and GRACE Follow-On Missions." Geophysical Research Letters 47, Issue 8 (28 April 2020): e2020GL087291. https://doi.org/10.1029/2020GL087291.

8. National Snow and Ice Data Center World Glacier Monitoring Service

9. National Snow and Ice Data Center D.A. Robinson, D. K. Hall, and T. L. Mote, "MEaSUREs Northern Hemisphere Terrestrial Snow Cover Extent Daily 25km EASE-Grid 2.0, Version 1 (2017). Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/MEASURES/CRYOSPHERE/nsidc-0530.001 . http://nsidc.org/cryosphere/sotc/snow_extent.html Rutgers University Global Snow Lab. Data History

10. R.S. Nerem, B.D. Beckley, J. T. Fasullo, B.D. Hamlington, D. Masters, and G.T. Mitchum, "Climate-change–driven accelerated sea-level rise detected in the altimeter era." PNAS 15, no. 9 (12 Feb. 2018): 2022-2025. https://doi.org/10.1073/pnas.1717312115.

11. https://nsidc.org/cryosphere/sotc/sea_ice.html Pan-Arctic Ice Ocean Modeling and Assimilation System (PIOMAS, Zhang and Rothrock, 2003) http://psc.apl.washington.edu/research/projects/arctic-sea-ice-volume-anomaly/ http://psc.apl.uw.edu/research/projects/projections-of-an-ice-diminished-arctic-ocean/

12. USGCRP, 2017: Climate Science Special Report: Fourth National Climate Assessment, Volume I [Wuebbles, D.J., D.W. Fahey, K.A. Hibbard, D.J. Dokken, B.C. Stewart, and T.K. Maycock (eds.)]. U.S. Global Change Research Program, Washington, DC, USA, 470 pp, https://doi.org/10.7930/j0j964j6 .

13. http://www.pmel.noaa.gov/co2/story/What+is+Ocean+Acidification%3F

14. http://www.pmel.noaa.gov/co2/story/Ocean+Acidification

15. C.L. Sabine, et al., “The Oceanic Sink for Anthropogenic CO2.” Science 305 (16 July 2004): 367-371. https://doi.org/10.1126/science.1097403.

16. Special Report on the Ocean and Cryosphere in a Changing Climate , Technical Summary, Chapter TS.5, Changing Ocean, Marine Ecosystems, and Dependent Communities, Section 5.2.2.3. https://www.ipcc.ch/srocc/chapter/technical-summary/

Header image shows clouds imitating mountains as the sun sets after midnight as seen from Denali's backcountry Unit 13 on June 14, 2019. Credit: NPS/Emily Mesner Image credit in list of evidence: Ashwin Kumar, Creative Commons Attribution-Share Alike 2.0 Generic.

Discover More Topics From NASA

Explore Earth Science

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The sum of Earth's plants, on land and in the ocean, changes slightly from year to year as weather patterns shift.

Facts About Earth

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IMAGES

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  3. Attractive Comments on PowerPoint Presentation

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  4. 14+ Tips on How to Make a Presentation (Examples & Templates)

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  6. How to Give a Good Presentation: 8 Things You Need to Know

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  6. Useful expressions for a good presentation

COMMENTS

  1. 30 Presentation Feedback Examples

    3. Create dialogue (and listen carefully) Feedback is never a one-way street. Without the opportunity for dialogue, you're already shutting down and not listening to the other person. Make sure you're creating space for dialogue and active listening. Invite questions — or, even better, feedback.

  2. Presentation Skills: 40 Useful Performance Feedback Phrases

    Presentation Skills: Exceeds Expectations Phrases. Always prepares well before making any form of presentation whether formal or non-formal. Gives a clear and well-structured delivery when making a presentation. Exhibits excellent skill when it comes to expressing ideas and opinions with clarity. Knows the audience well enough to use proper ...

  3. Giving effective feedback on presentations #2

    Giving students your opinions on their presentation is important, but make sure that you give them a specific action they can do to implement your feedback. Examples of how feedback can be improved with actions is below: Weak pieces of feedback. Stronger pieces of feedback. Your vocabulary is weak.

  4. How to Give Effective Presentation Feedback

    Achievable: The goal of the presentation should be attainable. For example, "Trim your slides to no more than six lines per slide and no more than six words per line; otherwise, you are just reading your slides.". Realistic: The feedback you give should relate to the goal the presenter is trying to achieve. For example, "Relating the ...

  5. How to give feedback about a presentation

    Worse, bad presentations reduce the love of life! 😉. Start with something specific and concrete. For example, you might want to look at the slide's colour scheme. Once you've picked your "point of entry" for feeding back, go for a question. Use an open question, not something Fred can close down with a simple yes/no.

  6. How to Give a Good Presentation: 11 Top Tips for Killer ...

    How to Give a Good Presentation. Here's a quick look at the 11 tips on how to give a good presentation. Plus, you'll find a bonus resource you won't want to miss, The Visme Presentation Guru Course. Rehearse What You're Planning to Say. Prepare Mentally, Emotionally and Technically. Start Strong.

  7. PDF Giving Constructive Feedback on Presentations

    1. Positive phrasing - provide a positive framework for the message. Explicitly identify and positively reinforce what was done well Constructive feedback is based on a foundation of trust between sender and receiver. Examine your own motives: be sure your intention is to be helpful, not to show how perceptive and superior you are; be on the ...

  8. Effective Presentation Feedback (digital & sheets)

    With SlideLizard your attendees can easily give you feedback directly with their Smartphone. After the presentation you can analyze the result in detail. type in your own feedback questions. choose your rating scale: 1-5 points, 1-6 points, 1-5 stars or 1-6 stars; show your attendees an open text field and let them enter any text they want.

  9. How to improve your presentation skills with constructive feedback

    Create a distraction-free time and space for getting feedback. Ideally both of you should be present, focused, and open. If we're feeling stressed or pressed for time, it's hard to be a good feedback partner. That's why it's wise to tune in to how you're feeling before you schedule a session. Remind the person that you're looking ...

  10. Giving Effective Feedback On Presentations #1

    Focus on all the aspects of the presentation the student has done well. It is much easier for people to accept feedback if there is a balance between positive and negative. However, positive feedback does not mean writing a comment like 'good work'. Use a framework or marking sheet (see example below) to help you point out what they did well.

  11. Collecting Presentation Feedback to Improve Your Skills

    That's up to you. But however you decide to collect presentation feedback, use the comments you receive to: Assess what you are doing well and where you need to improve. Understand how your message is being received by others. Direct you toward achieving your goals (e.g., increase your number of sales)

  12. How to Give a Good Presentation: 10 Tips

    If your presentation is long, including a video for your audience to watch is an excellent way to give yourself a break and create new jumping-off points for your speech. 4. Be aware of design techniques and trends. Thanks to cutting-edge technology and tools, you have numerous platforms at your disposal to create a good presentation.

  13. How to give feedback on a presentation

    Do a few rounds of feedback. As everyone gives their feedback, they can collaborate in comment threads in the bubble. This allows everyone to see what's been said already, including all the context and nuance of the discussion, keeping everyone on the same page. The presenter can follow up with comments, and those giving feedback can watch the ...

  14. What It Takes to Give a Great Presentation

    Here are a few tips for business professionals who want to move from being good speakers to great ones: be concise (the fewer words, the better); never use bullet points (photos and images paired ...

  15. 30 Presentation Feedback Examples

    Are you notice presentations are deviating off-topic, try to steer it back to the important topic being discussed. 3 piece to look for available providing presentations answer. Presentation feedback can must intimidating. It's likely the presenter has verwendet a good deal regarding time and energy on creating the presentation.

  16. 30 Positive Feedback Examples: Best Practices & Examples

    30 Positive Feedback Examples. 1. Exceptional Work. Acknowledging a colleague's exceptional work can motivate them to continue to produce high-quality work and inspire others to strive for excellence as well. It shows that their efforts are valued and recognized, which can boost their morale and confidence.

  17. Compliment or Praise a Speaker

    Example Letter #1. Copied. I thoroughly enjoyed your presentation yesterday evening. Your delivery was so engaging that I lost all track of time. By any measure you are a very effective speaker and educator. I found your comments regarding future computers especially intriguing.

  18. How To Make a Good Presentation [A Complete Guide]

    Apply the 10-20-30 rule. Apply the 10-20-30 presentation rule and keep it short, sweet and impactful! Stick to ten slides, deliver your presentation within 20 minutes and use a 30-point font to ensure clarity and focus. Less is more, and your audience will thank you for it! 9. Implement the 5-5-5 rule. Simplicity is key.

  19. What Are Effective Presentation Skills (and How to Improve Them)

    Presentation skills are the abilities and qualities necessary for creating and delivering a compelling presentation that effectively communicates information and ideas. They encompass what you say, how you structure it, and the materials you include to support what you say, such as slides, videos, or images. You'll make presentations at various ...

  20. Top Tips for Effective Presentations

    Try a story (see tip 7 below), or an attention-grabbing (but useful) image on a slide. 6. Remember the 10-20-30 Rule for Slideshows. This is a tip from Guy Kawasaki of Apple. He suggests that slideshows should: Contain no more than 10 slides; Last no more than 20 minutes; and. Use a font size of no less than 30 point.

  21. How to critique a presentation

    When you discuss these 3 things, you help someone else take their presentation to the next level.

  22. 10 Tips for Giving a Great Presentation to an Audience

    Follow these tips to help you create a presentation that will engage your audience: 1. Keep your presentation simple. When putting your presentation together, remember that simpler is better. Many presenters follow the "10-20-30" rule, which is to use 10 or fewer slides, keep your presentation under 20 minutes and use at least 30-point font.

  23. How to Give More Powerful Positive Feedback

    Start By Reading This. 2. Pushes beyond his or her comfort zone and could use a confidence boost (e.g., if the person is shy about public speaking or new to it). "Your presentation today was so engaging. I especially liked how you spoke up clearly and made a point of making eye contact with each person in the room.

  24. Evidence

    Takeaways The rate of change since the mid-20th century is unprecedented over millennia. Earth's climate has changed throughout history. Just in the last 800,000 years, there have been eight cycles of ice ages and warmer periods, with the end of the last ice age about 11,700 years ago marking the beginning of the modern climate […]