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Think about the goal of your presentation. Know your audience's background to help you structure your presentation. Select your main points based on the length of your presentation. Find your best-supporting information.

Article:
You should always begin with the end in mind when it comes to planning a presentation. Think about what you're trying to convey, and the best means to do so in the time you have.  Write down your most important points. See if you notice a key point emerging. If your audience were to take away one thing from this presentation, what would it be? Don't just bombard your audience with facts. Think about what these facts do for your audience. What's the point you're trying to make with the information? If your topic isn't common knowledge, then you'll need to include that information in your presentation and ensure that you have enough time for it. You should also consider what your audience expects from the presentation. For example:  Are you trying to sell them a product, introduce them to a new idea, alter their way of thinking? Think about the kind of people in your audience. Do you have a tougher crowd, or do you have a group of enthusiastic people excited about what you're going to say? Ask yourself what statements, facts, and points best illustrate the theme of your presentation. A 10-minute presentation, for example, should include no more than 3 points. You should also consider the way the points relate to one another, and be prepared to discuss them in a logical, cohesive fashion. Not all points will relate to one another.  For example, if you're talking to a company about recycling program, you might discuss how corporate pollution contributes to global warming and how recycling can help the company save money. You wouldn't discuss the melting ice caps as a key point. Melting ice caps are a valid concern, but they are a fact or a supporting point. Comb through the research you are presenting. Look for your most solid supporting information. This should be the information that will really get the audience thinking, and can inspire change. Supporting information should do three things:  Add clarity to your argument by explaining anything the audience may not understand. For example: a brief overview of pollution's effect on climate change. Add authority by making connections with existing research, studies, and information. For example, you could mention the consensus in the scientific community that global warming is manmade and cite a few studies. Add color to your argument through visuals, like pictures and videos. For instance, you could show a chart of the amount of waste an average corporation produces in one month.