The politics of coalition is inherent in the political process of most European countries. Coalition may be analyzed either theoretically or empirically; this study reconciles both approaches. Providing insight into contemporary coalition theory and placing it in the context of coalition politics, this work examines five basic themes: the identity and motivation of those involved in coalition politics; the eventual membership of coalitions; durability; payoffs; and the impact of constitutional, behavioral, and historical constraints on the process of coalition bargaining.