This cahpter teaches you wheather you are writing a persuasive essay, alob report or project porposal, how defining key terms help you distinguish the boundaries of your subjact. Your goal is to choose a word or phrase that interests you, explore what it means (and doesn't mean)First you decide what you want your writing entertaining, inform, explain, persuade readres to act or combination of these. You select a startegies that help you accomplish your purpose.