Part 1 Can political models predict union behaviour?, Robert J. Flanagan: trade unions - models and institutions; classical voting models and union behaviour; the descriptive power of the median voter model; institutional structure and voting outcomes; union leaders and union members; a stocktaking; comment, Alistair Ulph; comment, Assar Lindbeck. Part 2 Bargaining structure and economic performance, Karl Ove Moene et al: wage demands by unions and employers; bargaining models of wage-setting; conflicts over the level of bargaining; comment, Assar Lindbeck; comment, Lars Calmfors.