Take a subject about which you’re passionate, and think carefully about why you believe what you do. If you find that you don’t have sufficient reason (perhaps you don’t really know all the facts involved), then research the subject until you can really back up your opinion. If you have a strong reason for believing what you do, then this is your persuasive angle. Your task, then, is to write a short speech persuading someone else to believe you using the evidence you have gathered and your own personal experience. Your speech can be as long as you like, but it should be at least 600 words.