A continuation of Logical Thinking (which is recommended but not required as a prerequisite). This course covers: a step-by-step guide to formulating valid definitions, conceptual fallacies (including "anti-concepts", propositional fallacies ("self- exclusion and the "stolen concept, how to achieve unit-economy in writing, logic and the subconscious, and techniques of problem solving. The course is a combination of exposition and practical training, with class time approximately evenly divided between lecture and discussion of home work exercises, all of which are new.