The plan of Dynamics of Contention embraces several goals. The first is to revitalize social-movement theory, to make it more dynamic, to transcend sharp distinctions between (for example) actors and trajectories. The second is to tear down the barriers between subdisciplines in social science such as social-movement theory and the study of nationalisms. These are conventional demarcations which the authors see as arbitrary and counterproductive to new insights that may be gained within a broader field of contentious politics. Finally the centrepiece: the authors aim to develop an explanatory strategy that avoids two pitfalls – particularistic history and sweeping generalizations in the tradition of Carl Hempel's covering law model. They propose the following solution. First, identify a number (not too large) of causal mechanisms that are at work in different times and places. Secondly, examine whether these mechanisms link regularly, whether they concatenate into what the authors call “robust processes”, i.e. processes that may be identified in a number of different historical “episodes”. An “episode” is something unique and circumscribed, not something ephemeral. On the other hand, an episode of nation-building may last for years. The authors' ambition seems to be to offer lean and muscular, but not parsimonious, explanations. To use their own words, their programme aims to “uncover recurring sets of mechanisms that combine into robust processes which, in turn, recur over a surprising number and broad range of episodes” (p. 314).