Factionalism in multi-level contexts : when party organization becomes a device

This article provides a dynamic framework through which factionalism can be examined and the circumstances of individual parties compared in multi-level contexts. We discuss the interaction between factionalism and party structure by setting out a model of factional organization dependent on the tolerance of host parties to dissent and their degree of vertical integration, their combination yielding four possible strategies for opposition factions: centralized, inter-layered, multi-layered and decentralized. We also consider what implications there are for the party's dominant coalition in episodes of high factionalism. These act as a catalyst for the modification of party rules that regulate dissent and vertical distribution of power. The hypotheses developed are tested on four Spanish political parties that differ on the autonomy of regional branches and factions, the competitive position in the party system and factionalism type - more policy or more patronage-oriented