So far, we have practiced many improvisation skills, but the difference between a good speech, and a memorable one, is how well you prepare the second. There are some tips that, when used properly, allow you to communicate your ideas in amazing speeches. These are the following.
Stats: The best speeches tell your audience things they didn't know, so look for some salient, accurate and up-date facts and figures.
But always remember that a stat is JUST A NUMBER, it won`t impress anyone by itself, (well, it can, depending on the stat); it all depends on how you use it, the context, etc. An example:
“60% of people in the world live with less than 2 $ a day “…. So what? , instead you could say:
“60% of people earn less than 2 $ a day…. What can YOU do with two dollars? Nothing! , well, if you think about it, you can do a few things: you can starve to death, you can sleep on the streets, but nothing more”
By the way, try to tell the source, (reports form the UN, NGO`S, etc) this will add credibility to your speech
Finally, showing some stats shows that you studied and know about the topic, impressing the audience and, specially, the chair.
Quotes: The lovely thing about quotes is that they say things that everybody knows, in ways that nobody can. Besides, the fact that somebody famous or universally respected said it (Churchill, Gandhi, Shakespeare, etc), will gain respect to your speech. Maybe people don’t like you, but they’ll like your speech
Make it personal: If you say something people do not care about, they won’t pay attention. Always try to make them feel that the problem affects them, or make then feel concerned about it. (very related to the “stories” point)
Stories: Some individual stories or things that happened allow you to show the essence of the problem, and the gravity of it in an almost pictorial way. Let the people imagine how awful is a problem being discussed. For example, if you are talking about “food security in...