Very well organized approach to both qualitative and quantitative studies in the social sciences. KKV explain in depth and justify what, realistically, many of us do unconciously (though incompletely) in making causal inferences. An invaluable read for anyone in the social sciences, and particularly those interested in a case-study approach to a given problem. KKV manage to explain much of their method in simple, readable terms, avoiding much of the jargon so commonly associated with methodological theory. Overall, I rate this book very highly for anyone interested in any type of causal inference, but in particular for those in the social sciences.