Social movement participation is widespread in most modern industrial democracies. To illustrate, the World Values Survey finds that 37.5 percent of the French, 30.8 percent of Germans, 26.3 percent of Canadians, and 15.1 percent of Americans report having participated in a protest (2010). While this is a large proportion of these countries' populations, what happens to these individuals after they have been initially mobilized? While some remain active and involved over time, not all activism is sustained. In this entry, I propose that there are multiple trajectories that participation can follow once an individual engages with a social movement; persistent participation, transfer, individual abeyance, or disengagement. Below, I outline these trajectories and explore the factors which lead to disengagement from movements over time.