Abstract
This paper explores differences in the party system development of two former Yugoslav republics: Slovenia and Montenegro. Despite sharing a communist institutional system, after that disintegrated Slovenia had a much faster pace of democratic consolidation and economic development than Montenegro. Similarly, the nature of the party competition and party system structure are also quite different. Using a quantitative and descriptive approach applied to the period between 1990 and 2018, we outline patterns of party competition and party system development and explore how they complement the stages of democratisation. We investigate how the comparatively faster democratisation in Slovenia is reflected in the competitive party system with a focus on the ideological divide as the chief source of electoral competition. In contrast, we look at how the prolonged transition in Montenegro is reflected in the closed party system with party competition occurring mainly along ethnic lines.