Abstract
This article examines Kirchheimer's catch‐all party thesis systematically, using the example of the Austrian Socialist Party (SPÖ). First, five central elements of the Kirchheimer catch‐all party are identified and possibilities for empirical research are explored. Then the empirical evidence on these five dimensions is analysed. As Kirchheimer has expected, the SPÖ's ‘ideological baggage’ has been drastically reduced, its top leadership groups and its electoral leader in particular have been further strengthened, the working‐class clientele has been de‐emphasised, and the party's function in the political system has been substantially reduced. Concerning the SPÖ's link to interest groups, however, Kirchheimer's thesis is only valid when looking at the most recent period. In view of the cumulative effect of the changes in the direction of a catch‐all party the SPÖ of the 1990s can definitely be classified as a catch‐all party.