Training in the basic skill ignored by conventional logic courses: the proper formation and use of concepts. The course focuses on conceptualization, definition, and hierarchical order-the areas where illogic is most widespread and most disastrous. It is in these areas that Ayn Rand's revolutionary discoveries can most dramatically improve one's thinking. A combination of theory and extensive practical exercises on: valid versus invalid concepts("package deals" and "anti-concepts"), a step-by-step guide to definition by essentials, the ultimate categories, the fallacies of "stolen concept" and self-exclusion, concretization and taking the "crow epistemology" seriously. (A 1990 course expanded)