The introduction to this book observed that while a macro theory of insurgency does not exist, a clear, concise, and comprehensive framework for analysis may nevertheless enhance our understanding by identifying major variables and the interplay among them that significantly affects the progress and outcomes of internal conflicts. Such a framework was set forth in Chapter 1 and then applied to seven diverse cases. These case studies provided a rich source of comparable data. It is now time to summarize what we have learned with respect to the variables and the relationships among them.