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How to Prepare Your Scientific Presentation

Since the dawn of time, humans were eager to find explanations for the world around them. At first, our scientific method was very simplistic and somewhat naive. We observed and reflected. But with the progressive evolution of research methods and thinking paradigms, we arrived into the modern era of enlightenment and science. So what represents the modern scientific method and how can you accurately share and present your research findings to others? These are the two fundamental questions we attempt to answer in this post. 

What is the Scientific Method?

To better understand the concept, let’s start with this scientific method definition from the International Encyclopedia of Human Geography :

The scientific method is a way of conducting research, based on theory construction, the generation of testable hypotheses, their empirical testing, and the revision of theory if the hypothesis is rejected. 

Essentially, a scientific method is a cumulative term, used to describe the process any scientist uses to objectively interpret the world (and specific phenomenon) around them. 

The scientific method is the opposite of beliefs and cognitive biases — mostly irrational, often unconscious, interpretations of different occurrences that we lean on as a mental shortcut. 

The scientific method in research, on the contrary, forces the thinker to holistically assess and test our approaches to interpreting data. So that they could gain consistent and non-arbitrary results. 

The common scientific method examples are:

• Systematic observation 
• Experimentation
• Inductive and deductive reasoning
• Formation and testing of hypotheses and theories

All of the above are used by both scientists and businesses to make better sense of the data and/or phenomenon at hand. 

The Evolution of the Scientific Method 

According to the Stanford Encyclopedia of Philosophy , ancient thinkers such as Plato and Aristotle are believed to be the forefathers of the scientific method. They were among the first to try to justify and refine their thought process using the scientific method experiments and deductive reasoning. 

Both developed specific systems for knowledge acquisition and processing. For example, the Platonic way of knowledge emphasized reasoning as the main method for learning but downplayed the importance of observation. The Aristotelian corpus of knowledge, on the contrary, said that we must carefully observe the natural world to discover its fundamental principles. 

In medieval times, thinkers such as Thomas Aquinas, Roger Bacon, and Andreas Vesalius among many others worked on further clarifying how we can obtain proven knowledge through observation and induction. 

The 16th–18th centuries are believed to have given the greatest advances in terms of scientific method application. We, humans, learned to better interpret the world around us from mechanical, biological, economic, political, and medical perspectives. Thinkers such as Galileo Galilei, Francis Bacon, and their followers also increasingly switched to a tradition of explaining everything through mathematics, geometry, and numbers. 

Up till today, mathematical and mechanical explanations remain the core parts of the scientific method. 

Why is the Scientific Method Important Today? 

Because our ancestors didn’t have as much data as we do. We now live in the era of paramount data accessibility and connectivity, where over 2.5 quintillions of data are produced each day. This has tremendously accelerated knowledge creation.

But, at the same time, such overwhelming exposure to data made us more prone to external influences, biases, and false beliefs. These can jeopardize the objectivity of any research you are conducting. 

Scientific findings need to remain objective, verifiable, accurate, and consistent. Diligent usage of scientific methods in modern business and science helps ensure proper data interpretation, results replication, and undisputable validity. 

6 Steps of the Scientific Method

Over the course of history, the scientific method underwent many interactions. Yet, it still carries some of the integral steps our ancestors used to analyze the world such as observation and inductive reasoning. However, the modern scientific method steps differ a bit. 

1. Make an Observation 

An observation serves as a baseline for your research. There are two important characteristics for a good research observation:

• It must be objective, not subjective. 
• It must be verifiable, meaning others can say it’s true or false with this. 

For example, This apple is red (objective/verifiable observation). This apple is delicious (subjective, harder-to-verify observation).

2. Develop a Hypothesis

Observations tell us about the present or past. But the goal of science is to glean in the future. A scientific hypothesis is based on prior knowledge and produced through reasoning as an attempt to descriptive a future event.

Here are characteristics of a good scientific hypothesis: 

• General and tentative idea
• Agrees with all available observations
• Testable and potentially falsifiable

Remember: If we state our hypothesis to indicate there is no effect, our hypothesis is a cause-and-effect relationship . A hypothesis, which asserts no effect, is called a null hypothesis. 

3. Make a Prediction 

A hypothesis is a mental “launchpad” for predicting the existence of other phenomena or quantitative results of new observations.

Going back to an earlier example here’s how to turn it into a hypothesis and a potential prediction for proving it. For example: If this apple is red, other apples of this type should be red too. 

Your goal is then to decide which variables can help you prove or disprove your hypothesis and prepare to test these. 

4. Perform an Experiment 

Collect all the information around variables that will help you prove or disprove your prediction. According to the scientific method, a hypothesis has to be discarded or modified if its predictions are clearly and repeatedly incompatible with experimental results.

Yes, you may come up with an elegant theory. However, if your hypothetical predictions cannot be backed by experimental results, you cannot use them as a valid explanation of the phenomenon. 

5. Analyze the Results of the Experiment

To come up with proof for your hypothesis, use different statistical analysis methods to interpret the meaning behind your data.

Remember to stay objective and emotionally unattached to your results. If 95 apples turned red, but 5 were yellow, does it disprove your hypothesis? Not entirely. It may mean that you didn’t account for all variables and must adapt the parameters of your experiment. 

Here are some common data analysis techniques, used as a part of a scientific method: 

• Statistical analysis
• Cause and effect analysis (see cause and effect analysis slides )
• Regression analysis
• Factor analysis
• Cluster analysis
• Time series analysis
• Diagnostic analysis
• Root cause analysis (see root cause analysis slides )

6. Draw a Conclusion 

Every experiment has two possible outcomes:

• The results correspond to the prediction
• The results disprove the prediction 

If that’s the latter, as a scientist you must discard the prediction then and most likely also rework the hypothesis based on it. 

How to Give a Scientific Presentation to Showcase Your Methods

Whether you are doing a poster session, conference talk, or follow-up presentation on a recently published journal article, most of your peers need to know how you’ve arrived at the presented conclusions.

In other words, they will probe your scientific method for gaps to ensure that your results are fair and possible to replicate. So that they could incorporate your theories in their research too. Thus your scientific presentation must be sharp, on-point, and focus clearly on your research approaches. 

Below we propose a quick framework for creating a compelling scientific presentation in PowerPoint (+ some helpful templates!). 

1. Open with a Research Question 

Here’s how to start a scientific presentation with ease: share your research question. On the first slide, briefly recap how your thought process went. Briefly state what was the underlying aim of your research: Share your main hypothesis, mention if you could prove or disprove them. 

It might be tempting to pack a lot of ideas into your first slide but don’t. Keep the opening of your presentation short to pique the audience’s initial interest and set the stage for the follow-up narrative.

2. Disclose Your Methods

Whether you are doing a science poster presentation or conference talk, many audience members would be curious to understand how you arrived at your results. Deliver this information at the beginning of your presentation to avoid any ambiguities. 

Here’s how to organize your science methods on a presentation: 

• Do not use bullet points or full sentences. Use diagrams and structured images to list the methods
• Use visuals and iconography to use metaphors where possible.
• Organize your methods by groups e.g. quantifiable and non-quantifiable

Finally, when you work on visuals for your presentation — charts, graphs, illustrations, etc. — think from the perspective of a subject novice. Does the image really convey the key information around the subject? Does it help break down complex ideas?

3. Spotlight the Results 

Obviously, the research results will be your biggest bragging right. However, don’t over-pack your presentation with a long-winded discussion of your findings and how revolutionary these may be for the community. 

Rather than writing a wall of text, do this instead:

• Use graphs with large axis values/numbers to showcase the findings in great detail
• Prioritize formats that are known to everybody (e.g. odds ratios, Kaplan Meier curves, etc.)
• Do not include more than 5 lines of plain text per slide 

Overall, when you feel that the results slide gets too cramped, it’s best to move the data to a new one. 

Also, as you work on organizing data on your scientific presentation PowerPoint template , think if there are obvious limitations and gaps. If yes, make sure you acknowledge them during your speech.

4. Mention Study Limitations 

The scientific method mandates objectivity. That’s why every researcher must clearly state what was excluded from their study. Remember: no piece of scientific research is truly universal and has certain boundaries. However, when you fail to personally state those, others might struggle to draw the line themselves and replicate your results. Then, if they fail to do so, they’d question the viability of your research.

5. Conclude with a Memorable Takeaway Message 

Every experienced speaker will tell you that the audience best retains the information they hear first and last. Most people will attend more than one scientific presentation during the day. 

So if you want the audience to better remember your talk, brainstorm a take-home message for the last slide of your presentation. Think of your last slide texts as an elevator pitch — a short, concluding message, summarizing your research.

To Conclude

Today we have no shortage of research and scientific methods for testing and proving our hypothesis. However, unlike our ancestors, most scientists experience deeper scrutiny when it comes to presenting and explaining their findings to others. That’s why it’s important to ensure that your scientific presentation clearly relays the aim, vector, and thought process behind your research.

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Scientific Presentation Guide: How to Create an Engaging Research Talk

Creating an effective scientific presentation requires developing clear talking points and slide designs that highlight your most important research results..

Scientific presentations are detailed talks that showcase a research project or analysis results. This comprehensive guide reviews everything you need to know to give an engaging presentation for scientific conferences, lab meetings, and PhD thesis talks. From creating your presentation outline to designing effective slides, the tips in this article will give you the tools you need to impress your scientific peers and superiors.

Step 1. Create a Presentation Outline

The first step to giving a good scientific talk is to create a presentation outline that engages the audience at the start of the talk, highlights only 3-5 main points of your research, and then ends with a clear take-home message. Creating an outline ensures that the overall talk storyline is clear and will save you time when you start to design your slides.

Engage Your Audience

The first part of your presentation outline should contain slide ideas that will gain your audience's attention. Below are a few recommendations for slides that engage your audience at the start of the talk:

• Create a slide that makes connects your data or presentation information to a shared purpose, such as relevance to solving a medical problem or fundamental question in your field of research
• Create slides that ask and invite questions
• Use humor or entertainment

Identify Clear Main Points

After writing down your engagement ideas, the next step is to list the main points that will become the outline slide for your presentation. A great way to accomplish this is to set a timer for five minutes and write down all of the main points and results or your research that you want to discuss in the talk. When the time is up, review the points and select no more than three to five main points that create your talk outline. Limiting the amount of information you share goes a long way in maintaining audience engagement and understanding. 

Create a Take-Home Message

And finally, you should brainstorm a single take-home message that makes the most important main point stand out. This is the one idea that you want people to remember or to take action on after your talk. This can be your core research discovery or the next steps that will move the project forward.

Step 2. Choose a Professional Slide Theme

After you have a good presentation outline, the next step is to choose your slide colors and create a theme. Good slide themes use between two to four main colors that are accessible to people with color vision deficiencies. Read this article to learn more about choosing the best scientific color palettes .

You can also choose templates that already have an accessible color scheme. However, be aware that many PowerPoint templates that are available online are too cheesy for a scientific audience. Below options to download professional scientific slide templates that are designed specifically for academic conferences, research talks, and graduate thesis defenses.

Step 3. Design Your Slides

Designing good slides is essential to maintaining audience interest during your scientific talk. Follow these four best practices for designing your slides:

• Keep it simple: limit the amount of information you show on each slide
• Use images and illustrations that clearly show the main points with very little text. 
• Read this article to see research slide example designs for inspiration
• When you are using text, try to reduce the scientific jargon that is unnecessary. Text on research talk slides needs to be much more simple than the text used in scientific publications (see example below).
• Use appear/disappear animations to break up the details into smaller digestible bites
• Sign up for the free presentation design course to learn PowerPoint animation tricks

Scientific Presentation Design Summary

All of the examples and tips described in this article will help you create impressive scientific presentations. Below is the summary of how to give an engaging talk that will earn respect from your scientific community. 

Step 1. Draft Presentation Outline. Create a presentation outline that clearly highlights the main point of your research. Make sure to start your talk outline with ideas to engage your audience and end your talk with a clear take-home message.

Step 2. Choose Slide Theme. Use a slide template or theme that looks professional, best represents your data, and matches your audience's expectations. Do not use slides that are too plain or too cheesy.

Step 3. Design Engaging Slides. Effective presentation slide designs use clear data visualizations and limits the amount of information that is added to each slide. 

And a final tip is to practice your presentation so that you can refine your talking points. This way you will also know how long it will take you to cover the most essential information on your slides. Thank you for choosing Simplified Science Publishing as your science communication resource and good luck with your presentations!

Interested in free design templates and training?

Explore scientific illustration templates and courses by creating a Simplified Science Publishing Log In. Whether you are new to data visualization design or have some experience, these resources will improve your ability to use both basic and advanced design tools.

Interested in reading more articles on scientific design? Learn more below:

Data Storytelling Techniques: How to Tell a Great Data Story in 4 Steps

Best Science PowerPoint Templates and Slide Design Examples

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5 tips for giving a good scientific presentation

What is a scientific presentation?

What is the objective of a scientific presentation, why is giving scientific presentations necessary, how to give a scientific presentation, tip 1: prepare during the days leading up to your talk, tip 2: deal with presentation nerves by practicing simple exercises, tip 3: deliver your talk with intention, tip 4: be adaptable and willing to adjust your presentation, tip 5: conclude your talk and manage questions confidently, concluding thoughts, other sources to help you give a good scientific presentation, frequently asked questions about giving scientific presentations, related articles.

You have made the slides for your scientific presentation. Now, you need to prepare to deliver your talk. But, giving an oral scientific presentation can be nerve-wracking. How do you ensure that you deliver your talk well, and leave a good impression on the audience?

Mastering the skill of giving a good scientific presentation will stand you in good stead for the rest of your career, as it may lead to new collaborations or even new employment opportunities.

In this guide, you’ll find everything you need to know to give a good oral scientific presentation, including

• Why giving scientific presentations is important for your career;
• How to prepare before giving a scientific presentation;
• How to keep the audience engaged and deliver your talk with confidence.

The following tips are a product of our research into the literature on giving scientific presentations as well as our own experiences as scientists in giving and attending talks. We advise on how to make a scientific presentation in another post.

A scientific presentation is a talk or poster where you describe the findings of your research to others. An oral presentation usually involves presenting slides to an audience. You may give an oral scientific presentation at a conference, give an invited seminar at another institution, or give a talk as part of an interview. A PhD thesis defense is one type of scientific presentation.

➡️ Read about how to prepare an excellent thesis defense

The objective of a scientific presentation is to communicate the science such that the audience:

• Learns something new;
• Leaves with a clear understanding of the key message of your research;
• Has confidence in you and your work;
• Remembers you afterward for the right reasons.

As a scientist, one of your responsibilities is disseminating your scientific knowledge by giving presentations. Communicating your research to others is an altruistic act, as it is an opportunity to teach others about your research findings, and the knowledge you have gained while researching your topic.

Giving scientific presentations confers many career benefits , such as:

• Having the opportunity to share your ideas and to have insightful conversations with other scientists. For example, a thoughtful question may create a new direction for your research.
• Gaining recognition for your work and generating excitement for your research program can help you to forge new collaborations and to obtain more citations of your papers. It's your chance to impress some of the biggest names in your field, build your reputation as a scientist, and get more people interested in your work.
• Improving your future employment prospects by getting presentation experience in high-stakes settings and by having talks listed on your academic CV.

➡️ Learn how to write an academic CV

You might have just 10 minutes for your talk. But those 10 minutes are your golden ticket. To make them shine, you'll need to put in some homework. You need to think about the story you want to tell , create engaging slides , and practice how you're going to deliver it.

Why all this effort? Because the rewards are potentially huge. Imagine speaking to the top names in your field, boosting your visibility, and getting more eyes on your work. It's more than just a talk; it's your chance to showcase who you are and what you do.

Here we share 5 tips for giving effective scientific presentations.

• Prepare adequately for your talk on the days leading up to it
• Deal with presentation nerves
• Deliver your talk with intention
• Be adaptable
• Conclude your talk with confidence

You should prepare for your talk with the seriousness it deserves and recognize the potential it holds for your career advancement. Here are our suggestions:

• Rehearse your talk multiple times to ensure smooth flow. Know the order of your slides and key transitions without memorizing every word. Practice your speech as though you are discussing with friendly and attentive listeners.
• Record your speech and listen back to yourself giving your talk while doing household chores or while going for a walk. This will help you remember the important points of your talk and feel more comfortable with the flow of it on the day.
• Anticipate potential questions that may arise during your talk, write down your responses to those questions, and practice them aloud.
• Back up your presentation in cloud storage and on a USB key. Bring your laptop with you on the day of your talk, if needed.
• Know the time and location of your talk. Familiarize yourself with the room, if you can. Introduce yourself to the moderator before the session begins.
• Giving a talk is a performance, so preparing yourself physically and mentally is essential. Prioritize good sleep and hydration, and eat healthy, nourishing food on the day of your talk. Plan your attire to be both professional and comfortable.

It’s natural to feel nervous before your talk, but you want to harness that energy to present your work with confidence. Here are some ways to manage your stress levels:

• Remember that your audience want to listen to you and learn from you. Believe that your audience will be kind, friendly, and interested, rather than bored and skeptical.
• Breathing slow and deep before your talk calms the mind and nervous system. Psychologist Amy Cuddy recommends practicing open, confident postures while sitting and standing to help you get into a positive frame of mind.
• Fight off impostor syndrome with positive affirmations. You’ve got this! Remember that you know more about your research than anyone else in the room and you are giving your talk to teach others about it.

Giving your talk with confidence is crucial for your credibility as a scientist. Focusing on your delivery helps ensure that your audience remembers and believes what you say. Here are some techniques to try:

• Before beginning, remember your professional goals and the benefits of giving your presentation. Start with a smile and exhale deeply.
• Memorize a simple opening. After the moderator introduces you, pause and take a breath. Welcome the audience, thank them for coming, and introduce yourself. You don’t need to read the title of your talk. But briefly, say something like, “today I’m going to talk to you about why [topic] is important and [what I hope you will learn from this talk]” in 1-2 sentences. Preparing your opening will settle your nerves and prevent you from starting your talk on a tangential topic, ensuring you stay on time.
• Project confidence outwardly, even if you feel nervous. Stand up tall with your shoulders back and make eye contact with individuals in the audience. Move your focus around the room, so everyone in the audience feels included.
• Maintain open body language and face the audience as much as possible, not your slides.
• Project your voice as much as you can so that people at the back of the room can hear you. Enunciate your words, avoid mumbling, and don’t trail off awkwardly.
• Varying your vocal delivery and intonation will make your talk more interesting and help the audience pay attention, particularly when you want to emphasize key points or transitions.
• Pausing for dramatic effect at crucial moments can help you relax and remember your message, as well as being an effective engagement device.
• A laser pointer can be off-putting for the audience if you are prone to having a shaky hand when nervous. Use a laser pointer only to emphasize information on the slide while providing an explanation. If you design your slides thoughtfully , you won’t need to use a laser pointer.

Not all parts of your talk may go according to plan. Here are some ways to adapt to hitches during your talk:

• Handle talk disruptions gracefully. If you make a mistake, or a technical issue occurs during your talk, remember that it’s okay to skip something and move on without apologizing.
• If you forget to mention something but the audience hasn’t noticed, don’t point it out! They don’t need to know.
• As you give your talk, be time-conscious, and watch the moderator for signals that the time is about to expire. If you realize you won’t have time to discuss all your slides, skip the less important ones. Adjust your presentation on the fly to finish on time, prioritizing content as needed.
• If you run out of time completely, just stop. You don’t have to give a conclusion, but you do need to stop on time! Practicing your talk should prevent this situation.

The ending of your talk is important for emphasizing your key message and ensuring the audience leave with a positive impression of you and your work. Here are some pointers.

• Conclude your talk with a memorized closing statement that summarizes the key take-home message of your research. After making your closing statement, end your talk with a simple “Thank you”. Then pause and wait for the applause. You don’t need to ask if the audience has questions because the moderator will call for questions on your behalf.
• When you receive a question, pause, then repeat the question. This ensures the whole audience understands the question and gives you time to calmly consider your answer.
• In a talk on attaining confidence in your scientific presentations, Michael Alley suggests that if you don’t know the answer to the question, then emphasize what you do know. Say something like, “Although I can’t fully answer your question, I can say [this about the topic].”
• Approach the Q&A with interest rather than anxiety by reframing it as an opportunity to further share your knowledge. Being curious, instead of feeling fearful, can help you shine during what might be the most stressful part of your presentation.

Communicating your research effectively is a key skill for early career scientists to learn. Taking ample time to prepare and practice your presentation is an investment in your scientific development.

But here's the good part: all that effort pays off. Think of your talk as not just a presentation, but as a way to show off what you and your research are all about. Giving a compelling scientific presentation will raise your professional profile as a scientist, lead to more citations of your work, and may even help you obtain a future academic job.

But most importantly of all, giving talks contributes to science, and sharing your knowledge is an act of generosity to the scientific community.

➡️ Questions to ask yourself before you make your talk

➡️ How to give a great scientific talk

1) Have a positive mindset. To help with nerves, breathe deeply and keep in mind that you are an authority on your topic. 2) Be prepared. Have a short list of points for each slide and know the key transition points of your talk. Practice your talk to ensure it flows smoothly. 3) Be well-rested before your talk and eat a light meal on the day of your presentation. A talk is a performance. 4) Project your voice and vary your vocal intonation and pitch to retain the interest of the audience. Take pauses at key moments, for emphasis. 5) Anticipate questions that audience members could ask, and prepare answers for them.

The goal of a scientific presentation is that the audience remembers the key outcomes of your research and that they leave with a good impression of you and your science.

Take a moment to exhale deeply and collect your thoughts after the moderator has introduced you. Don’t read your talk's title. Instead, introduce yourself, thank the audience for attending, and provide a warm welcome. Then say something along the lines of, "Today I'm going to talk to you about why [topic] is important and [what I hope you will learn from this presentation].” A rehearsed opening will ensure that you start your talk on a confident note.

Prepare a memorable closing statement that emphasizes the key message of your talk. Then end with a simple “Thank you”.

Preparation is key. Practice many times to familiarize yourself with the content of your presentation. Before giving your talk, breathe slowly and deeply, and remind yourself that you are the expert on your topic. When giving your talk, stand up tall and use open body language. Remember to project your voice, and make eye contact with members of the audience.

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Designing PowerPoint Slides for a Scientific Presentation

In the video below, we show you the key principles for designing effective PowerPoint slides for a scientific presentation.

Using examples from actual science presentations, we illustrate the following principles:

• Create each slide as a single message unit
• Explicitly state that single message on the slide
• Avoid bullet points-opt for word tables
• Use simple diagrams
• Signal steps in biological processes
• Annotate key biological structures
• Annotate data in tables and graphs

You can also find this video, and others related to scientific communication, at the CLIMB youtube channel: http://www.youtube.com/climbprogram

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Oral Presentation Structure

Finally, presentations normally include interaction in the form of questions and answers. This is a great opportunity to provide whatever additional information the audience desires. For fear of omitting something important, most speakers try to say too much in their presentations. A better approach is to be selective in the presentation itself and to allow enough time for questions and answers and, of course, to prepare well by anticipating the questions the audience might have.

As a consequence, and even more strongly than papers, presentations can usefully break the chronology typically used for reporting research. Instead of presenting everything that was done in the order in which it was done, a presentation should focus on getting a main message across in theorem-proof fashion — that is, by stating this message early and then presenting evidence to support it. Identifying this main message early in the preparation process is the key to being selective in your presentation. For example, when reporting on materials and methods, include only those details you think will help convince the audience of your main message — usually little, and sometimes nothing at all.

The opening

• The context as such is best replaced by an attention getter , which is a way to both get everyone's attention fast and link the topic with what the audience already knows (this link provides a more audience-specific form of context).
• The object of the document is here best called the preview because it outlines the body of the presentation. Still, the aim of this element is unchanged — namely, preparing the audience for the structure of the body.
• The opening of a presentation can best state the presentation's main message , just before the preview. The main message is the one sentence you want your audience to remember, if they remember only one. It is your main conclusion, perhaps stated in slightly less technical detail than at the end of your presentation.

In other words, include the following five items in your opening: attention getter , need , task , main message , and preview .

Even if you think of your presentation's body as a tree, you will still deliver the body as a sequence in time — unavoidably, one of your main points will come first, one will come second, and so on. Organize your main points and subpoints into a logical sequence, and reveal this sequence and its logic to your audience with transitions between points and between subpoints. As a rule, place your strongest arguments first and last, and place any weaker arguments between these stronger ones.

The closing

After supporting your main message with evidence in the body, wrap up your oral presentation in three steps: a review , a conclusion , and a close . First, review the main points in your body to help the audience remember them and to prepare the audience for your conclusion. Next, conclude by restating your main message (in more detail now that the audience has heard the body) and complementing it with any other interpretations of your findings. Finally, close the presentation by indicating elegantly and unambiguously to your audience that these are your last words.

Starting and ending forcefully

Revealing your presentation's structure.

To be able to give their full attention to content, audience members need structure — in other words, they need a map of some sort (a table of contents, an object of the document, a preview), and they need to know at any time where they are on that map. A written document includes many visual clues to its structure: section headings, blank lines or indentations indicating paragraphs, and so on. In contrast, an oral presentation has few visual clues. Therefore, even when it is well structured, attendees may easily get lost because they do not see this structure. As a speaker, make sure you reveal your presentation's structure to the audience, with a preview , transitions , and a review .

The preview provides the audience with a map. As in a paper, it usefully comes at the end of the opening (not too early, that is) and outlines the body, not the entire presentation. In other words, it needs to include neither the introduction (which has already been delivered) nor the conclusion (which is obvious). In a presentation with slides, it can usefully show the structure of the body on screen. A slide alone is not enough, however: You must also verbally explain the logic of the body. In addition, the preview should be limited to the main points of the presentation; subpoints can be previewed, if needed, at the beginning of each main point.

Transitions are crucial elements for revealing a presentation's structure, yet they are often underestimated. As a speaker, you obviously know when you are moving from one main point of a presentation to another — but for attendees, these shifts are never obvious. Often, attendees are so involved with a presentation's content that they have no mental attention left to guess at its structure. Tell them where you are in the course of a presentation, while linking the points. One way to do so is to wrap up one point then announce the next by creating a need for it: "So, this is the microstructure we observe consistently in the absence of annealing. But how does it change if we anneal the sample at 450°C for an hour or more? That's my next point. Here is . . . "

Similarly, a review of the body plays an important double role. First, while a good body helps attendees understand the evidence, a review helps them remember it. Second, by recapitulating all the evidence, the review effectively prepares attendees for the conclusion. Accordingly, make time for a review: Resist the temptation to try to say too much, so that you are forced to rush — and to sacrifice the review — at the end.

Ideally, your preview, transitions, and review are well integrated into the presentation. As a counterexample, a preview that says, "First, I am going to talk about . . . , then I will say a few words about . . . and finally . . . " is self-centered and mechanical: It does not tell a story. Instead, include your audience (perhaps with a collective we ) and show the logic of your structure in view of your main message.

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