Abstract
This article seeks to show the connection between the ‘positive’ integration of anti‐system oppositions and governmental coalitional strategies in four European polarised democracies (the French Fourth Republic, the Weimar Republic, Finland and Italy). It tests the possibility of a stabilisation of some polarised systems (Finland and Italy) through the extension of co‐operation between anti‐system oppositions and centre parties in government. The aim of this research is therefore to locate some of the factors which can halt the ‘enfeeblement of the centre’ in polarised systems, namely through the ‘conversion’ of at least part of the anti‐system oppositions into loyal or semi‐loyal ones, and the extension of the centre area of the party system.

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