The introduction to a speech has three critical parts: you must gain the attention and interest of your audience, you must tell your audience the primary goal of your speech, and you must give a preview of the points that will support your chief argument.
Before you tell your audience why you’re giving your speech and how your argument will be supported, you must get their attention and interest. There’s little point in giving a speech to an uninterested, inattentive audience.
To captivate your audience, you could do many things: You could tell a quick poignant story related to the thesis of your speech. You could recite a powerful quote connected to the topic of your speech. You could even employ a visual aid, like a picture or a short video clip.
Now that you have the attention and interest of your audience, it’s time to tell them what your speech will primarily be about. Don’t try and be clever or coy. Use direct language. You don’t want them to be confused. When giving a preview of your main points, use clear language as well.
As for the conclusion, the conclusion should mirror the introduction. The conclusion is your way of reminding the audience of what they just heard and learned. You shouldn’t present any new information in your conclusion. Your conclusion isn’t the place to launch another argument or bring in a new point. Restate your central point, and reiterate your supporting claims.