“This is a landmark book. It is a landmark not only because of its content but because of what the book indicates about the . . . status of sociological methodology. . . . The book overall is a first-rate contribution to social science methodology.” —George Bohrnstedt, Social Forces Casual models—formal theories stating the relationships between precisely defined variables—have become an indispensable tool of the social scientist. This book draws upon the best writing in a variety of fields to provide a comprehensive picture of contemporary work on this subject.