This book explains the contrasting strategies and their electoral fortunes of social democratic parties in the major European democracies in the 1970s and 1980s. Going beyond approaches that focus on the influence of class structure and political economic institutions, The Transformation of European Social Democracy analyses the party's competitive situation in the electoral arena, the constraints and opportunities of party organisation, and the role of ideological legacies to explain the strategic choices social democratic parties have made and the electoral results they have achieved. Far from being doomed to decline, social democracy's success depends on its ability to transform its political message and to construct new electoral coalitions.