如何做一个优美的幻灯演示？很复杂的一个命题，如果真说起来，可能一个月都说不完。但是一个优美的幻灯还是有章可循的。ERIN BEDFORD 有一文讲的不错。
Love it or hate it, PowerPoint is everywhere. 「Preparing a presentation」 has become synonymous to 「preparing a PowerPoint presentation」, but is this really a good attitude when it comes to communicating research? PowerPoint is a tool, and as with any tool, its true power comes not from the tool itself but from the one who holds it. Like dynamite, handled properly it can blast through the mountain that is communication between presenter and audience, but placed in the wrong hands and the audience may end up buried in the rubble.
I recently attended a great talk on the subject, which has got me thinking about presentations. What are the dangers of PowerPoint, how can we avoid them, and how can we make sure to keep focus on the content rather than the medium?
Identify your audience
Know your audience. Without them, there is no presentation. When presenting to a group of experts in your field, skip over the in-depth intro and focus most of your slides on the knitty-gritty details; when presenting to a group of first-year chemistry students, do the opposite. But it’s not always this easy. What about mixed audiences? For example, I gave a short talk last month to a group of graduate students in materials science, which is so broad a field that many were not at all familiar with my subject. On the one hand, I wanted everyone in the audience to be able to understand my work; on the other hand, one of the goals of the series of talks was to find solutions to research problems we might be having, so it was important to present the details of my research. With only 10 minutes to talk, I couldn’t do both, so I had to identify who in the audience I wanted to present to. In this case, I decided that if I wanted tips from those in my field, I would have to present my results in detail, so I prepared a presentation with a brief introduction and focused more on my results. Many conferences are multidisciplinary, so choosing who in the audience you want to direct your talk to is an important first step in preparing a presentation.
A presentation is not a paper
Rarely do we read a journal article linearly. We read the abstract, look at the tables and figures, glance at the conclusion, then maybe go back and read the rest. Because of this, journal articles are written in a predictable way, conducive to this jumping between sections (and online formats are making this even easier). Methods are separate from results, even when there are multiple steps involved.
With a presentation, you’re forcing the audience to follow you in a particular order, so make sure that the order makes sense. The linearity of a PowerPoint presentation means that the audience can’t make the same abstract connections that they can when reading a paper; by the time they’ve registered one concept, you’ve moved on to something else. Keep similar ideas together to reduce the need for remembering. This might mean that there is no methods section, but rather methods are discussed at the same time as their corresponding results. It also might mean that you repeat information or show the same graph twice if needed. Another useful tip is to use informative titles; rather than titling a slide 「Results」, use descriptive titles like 「A increases B」. This can provide a quick catch-up point for audience members who are still thinking about the previous slide.
Keep it simple and clear
There’s no point in using slides if no one can read them. Use big fonts, clear images, contrasting colors, motion only when it serves a purpose… There are numerous sites that give tips on the design aspects of a PowerPoint presentation; to start, check out the amusing Death by PowerPoint or one of Lifehackers’s posts on the subject. You don’t have to be a graphic designer to put together a good presentation. By taking some time to think about the clarity of your slides, the audience will be grateful.
PowerPoint is meant to complement, not be, a presentation
PowerPoint has made us lazy. It’s too easy to put what we want to say on a slide and read it while the audience looks at the pretty pictures instead of focusing on the presenter. While having visuals associated with a presentation can be extremely useful, we don’t attend talks to look at data and read conclusions. Everything that is on a slide should be there only to help the audience understand what is being said. When planning on leaving a handout for interested audience members, prepare a separate handout that includes the necessary detail rather than trying to put everything on the slides. Or as another option, record your presentation and put it online.
PowerPoint is everywhere, and it’s not going away anytime soon. Used properly, it’s an excellent tool for conveying the complex information we deal with in research. But a bit of kindness towards the audience will go a long way－they’ll be more interested and our fascinating research will be remembered.