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Quick and Dirty Tips . This is from listener Joe P: What’s the rule for determining how many slides to use in a presentation? Well, like many answers from consultants, my answer is .
It depends on the complexity of the content. It depends on if the slides are heavy in graphics or text.
It depends if the slides use many progressive builds; it depends on how the builds are created. I’ve seen successful, dynamic 3. If you don’t have at least 3. For example, you may have a photo with one element highlighted; then you click to the next slide which is the same photo, except with a different element highlighted, and so on. Although you are using different slides, you are building progressively through a single main idea or, in this case, a single photo. However, again, if you’re not using a build then less than 3.
For complex ideas (or text heavy slides), for sure you’ll need more than a minute of discussion. Typically technical speakers should spend 1. But, if it takes longer than say 3.
You could do it as a build or maybe you just break it up into two separate ideas. So, the bottom line is that I think you should ignore all “slide per minute” rules you may have heard and instead use as many slides as you need to clearly and efficiently communicate your ideas. I think you should ignore all “slide per minute” rules you may have heard and instead use as many slides as you need to clearly and efficiently communicate your ideas.
I do understand, however, that this advice doesn’t help you to figure out how much material you need to prepare- -which I think is the reason that most people ask this question to begin with. So, I have a different heuristic for that. Calculate Time Per Idea. I suggest taking your overall amount of time for the presentation, and then subtracting approximately 1. Then take the remaining time and divide it by the number of main ideas you’d like to present.
The result will tell you how much time you have to present each main idea within the body of your talk. So for example, if you are planning a 1. Which means you’re likely to have 4 or 5 slides for your main ideas (again depending on the content and the number of builds) and perhaps 3- 5 slides for the beginning and ending portions. This means you’d end up with between 7- 1. Let’s say you have a longer presentation, say 3. Again, subtract 1. Divide that by 4 (or 3 or 5 depending on how main ideas or main sections you’ve got).
For this example, you’d end up with about 7. Calculate Time Per Sub Point. With longer talks, the next step is to determine how many sub points you have to present per main idea and divide that into the time you have available for each main idea.
So if you have 3 subpoints for the first main idea then you’ll have about 2. Of course, you’ll need to do the calculation for each main point that you have. That above method of “calculation,” I think, is a much better way of determining how many slides you’ll need to cover your material. Certainly, it gives you a quick and dirty estimate of how many slides you’ll need to prepare.
Of course, after you have created the slides, you’ll need to check to be sure you’re within the time limits. Calculate Your Flash, Fast, and Descriptive Slides. I sometimes use a quick and dirty method to calculate the timing. I categorize each of the slides into “flash”, “fast”, or “descriptive”.
Flash slides take about 3. Then, using these rough estimates, I can calculate how long it should take to make the presentation. However, the only way to know for sure if I’ve have prepared the correct amount of material is deliver the presentation. That means practice with a timer. However, I’ve noticed that some people run through the slides more quickly when they practice, others more slowly.
I call this the n- factor (that is the impact of your nervous energy on the delivery of the presentation). Always take into consideration the impact of your personal n- factor by either adding or subtracting time.
For example in a 3. That way you can adjust your pace as your are moving through the materials. If you are behind at ten minutes, you know that you’ll need to start cutting some of the “nice to know” material as you move forward; then at 1. If you are now ahead, you can slow down and take more time to discuss or take questions from audience.
The idea is to use the “timing” points to guide you along the way. I use this technique for every talk and it works well. Just before I deliver a talk I prepare a piece of paper with my “timings.” I start with the time I want to finish (always 8- 1. Then I add a few minutes to the start time, because most groups don’t get started exactly on time.
Then, on a small piece of paper, I calculate the exact time on the clock that represents my timing points. So, for example, I write 9: 1. Remember, I’m in my upper 4. I always keep a clock with a very large dial next to my laptop. That way I can easily check the time and where I should be within the presentation itself.
Double Check Your Math. One small warning though: double check, maybe even triple check your timings! Once I accidentally calculated the points incorrectly and didn’t realize it until I was about a 2/3 of the way through the presentation! Once I realized I had done it wrong, I had to cut a lot of material from the end of the presentation. I didn’t go over my time, but the presentation certainly wasn’t as good as it could have been. So there you have it, several techniques to help you determine how many slides to create and more importantly techniques to ensure that you successfully time your presentation and don’t go over your time limit.
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