Recent decades have witnessed a dramatic upsurge in the use of strategic nonviolent action as a method of political struggle worldwide, pressing governments and other institutions to change policies and even successfully ousting autocratic regimes. This has led to a growth in scholarly research on the history and dynamics of such popular civil resistance movements, along with growing empirical evidence indicating that nonviolent means are generally effective than armed resistance. Such nonviolent civil resistance is distinguished from pacifism in that it is not predicated on a principled commitment to nonviolence but out of recognition that it is the most effective means of popular struggle under the particular circumstances. Some theorists of nonviolent action advocate a more pluralistic model of power than found in traditional political science literature, emphasizing the withdrawal of consent, while others emphasize a structural analysis whereby the civil resistance targets pillars of support of a regime or other power holders. There are hundreds of methods of nonviolent resistance, which can be utilized in different circumstances and in varying phases of a struggle, which tend to result in higher levels of popular mobilization and defections by security forces and other regime supporters than armed methods.