(Logical) means persuading by the use of reasoning. This will be the most important technique we will study, and Aristotle's favorite. We'll look at deductive and inductive reasoning, and discuss what makes an effective, persuasive reason to back up your claims. Giving reasons is the heart of argumentation, and cannot be emphasized enough. We'll study the types of support you can use to substantiate your thesis, and look at some of the common logical fallacies, in order to avoid them in your writing.
EX:Let us begin with a simple proposition: What democracy requires is public debate, not information. Of course it needs information too, but the kind of information it needs can be generated only by vigorous popular debate. We do not know what we need to know until we ask the right questions, and we can identify the right questions only by subjecting our ideas about the world to the test of public controversy. Information, usually seen as the precondition of debate, is beter understood as its by product. When we get into arguments that focus and fully engage our attention, we become avid seekers of relevant information. Otherwise, we take in information passively--if we take it in at all.
Christopher Lasch, "The Lost Art of Political Argument"