The end of a strange gap in the sociology of mobilizations. the sample survey analysis of demonstrators : theoretical bases and technical solutions While the forms and springs of collective action are beginning to be better known, the individuals who demonstrate — the actors in street demonstrations — have not been subjected to studies centered on the modes of the move to action. Since Barnes and Kaase, we have serious survey studies of the propensity of individuals to demonstrate, but they provide data about representations, and in particular on the perception of the legitimacy of collective action and on the willingness to act, not on actual behavior. Most classic works on demonstrations take these as the units of analysis and build up m...