Book excerpt: Brings together contemporary essays from the journal Contention, on the causes and prediction of revolutions. Contributors discuss the Iranian, Eastern European, and French revolutions, and the theoretical and comparative aspects of revolutionary study, and respond to each other's views in debate style. Topics include the social interpretation of the French Revolution, demographic cycles and structural analysis in the world system, and global implications of the 1989 revolutions in Eastern Europe. Annotation copyright by Book News, Inc., Portland, OR