The eight essays in this part are concerned with the issues of theory appraisal that dominate writings on the methodology of economics. Chapter 1 offers a general overview of economic methodology and emphasizes that the subject is not exhausted by questions of theory assessment. Chapters 2, 3, 4, and 8 develop my views that the traditional deductive method provides (with some revisions) the best overall basis for assessing economic theories and that the difficulties involving theory assessment in economics result from the complexities of the subject matter economists study and the strategies or heuristics they use to simplify it. Chapters 5, 6, and 7 take issue with the influential views of economic methodology defended by Milton Friedman and Karl Popper.