The best type of evidence described in chapter 7 is that which is available at the present time, decoding it to the best of your ability, and remaining open to newer evidence materialize. In other words, preparing a speech requires research into whatever your topic is going to be. As evidence is presented you will have to analyze it and determine whether or not it supports the main goal of your speech. If it does, ask how appropriate the evidence is for your audience since different forms appeal to different audiences.