Definition: Resource mobilization theory is used in the study of social movements and argues that the success of social movements depends on resources (time, money, skills, etc.) and the ability to use them. When the theory first appeared, it was a breakthrough in the study of social movements because it focused on variables that are sociological rather than psychological. No longer were social movements viewed as irrational, emotion-driven, and disorganized. For the first time, influences from outside social movements, such as support from various organizations or the government, were taken into account.