My understanding about prewriting is to be able to brainstorm ideas for what you want to talk about, it allows you to outline and organize your thoughts and leaves less room for confusion. In order to have a successful prewriting assignment you have to be able to understand the question that is being asked and have a good layout that includes portions of what can better clarify your thesis. You have to create a sort of diagram that gives you a visual mapping of your ideas and shows the relationship between them. You also have to make sure you have proper evidence, an explanation and reasons. Gathering information and evidence takes time and research. The purpose of the prewriting assignment is to create a smoother and more efficient piece. You explore your ideas, main points and generate a clear structure. Prewriting saves time and extra effort you have to make and makes your final piece well structured.