This article attempts to draft a framework for the comparison of movement participation. The standards of comparison I developed at the movement level were the magnitude of mobilization potentials, the composition of multi-organizational fields, organizational characteristics, and action orientation. Utilizing this framework; I compared mobilization campaigns for three different types of activities conducted by three different movements: a campaign conducted by a labor union for, possibly, a strike, a campaign of the Dutch peace movement in a local community for a national demonstration, and campaigns by women's groups in a community for a variety of activities. I explain differences in motivational dynamics and levels of participation in terms of differing movement characteristics. Finally, I discuss the advantages of comparative work on social movements.