This has two aspects: the evaluation of arguments, and the construction or advancing of arguments. Some of the skills involved in this are: understanding of the standard fallacies; being able to distinguish between inductive and deductive arguments, and being able to say what constitutes an acceptable argument of both kinds; understand the role of counter-examples and be able to use them; understand the role of analogies and be able to use them; understand the role of thought experiments and be able to use them.