This article summarises the rapidly increasing number of studies dealing with parties' positional changes. After a short introduction and a brief discussion of a number of elementary definitions and delimitations, the second section evaluates eight factors commonly associated with party policy change. Here, the proposition that parties tend to respond systematically to changes in public opinion seems to be the most studied and, similarly, the most supported explanation. The third and final section identifies a number of research gaps and recommends topics for future research.

Despite their alleged anti-systemness and ‘non-coalitionability’, radical right and radical left parties have, since the early 1990s, both supported and entered coalition governments in a number of European liberal democracies. Using the classical ‘size and ideology’ framework, this study sets out to examine how – or, put differently, under what circumstances – radical right and radical left parties are able to overcome the obstacles associated with governing and enter coalition governments. Inspired by previous observations regarding the complex and multicausal nature of radical government participation, the study relies on a configurational method. By means of a fuzzy-set qualitative comparative analysis (fsQCA) of 37 radical parties at 207 coalition formation instances in 22 (Western and Central and Eastern) European countries, the article sheds light on different paths that lead to government inclusion (and exclusion) of radical actors. The empirical evidence indicates that electoral success in combination with a fairly similar policy position to a weak prime minister party is sufficient for government inclusion. The paths to government exclusion, by contrast, underline the importance of ideological distance in combination with size-related factors.

The fall of the communist regimes in Central and Eastern Europe was a shattering event for the Western European radical left, causing many parties to change their names and strategies. Despite prophesies pointing to the death of radical anti-capitalist politics, radical left parties (RLPs) still exist in all parts of Europe, and in many countries they have even been able to increase their influence. This paper seeks to provide a comparative mapping of the policies and policy positions of Western European RLPs before and after the fall of communism. The results of the examination indicate that although leftward trends can be observed in many RLPs in the early 2010s, the general, long-time, trend shows that the radical left family -and especially democratic socialist parties -have become less radical with regards to the core left-right dimension. Moreover, the study also shows that many RLPs -and, again, especially democratic socialist parties -have become more interested in other, non-socioeconomic, issues. Despite the rise of new left issues, the radical left is, however, still distinguishable from other parties mainly through their comparatively strong emphasis on old, traditional, left issues.

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