"This introductory article provides a preliminary explanation of the cross-national similarities and differences of union revitalization strategies discussed in this special issue. Differences in the institutional context of industrial relations as well as state policies and employer strategies explain some major differences in how national unions are responding to the current socio-economic challenges. However, our findings reveal that union responses are also influenced by their own internal structures. In particular, we use insights of the social movement literature to highlight the importance of the cognitive or `framing' processes through which unions as actors translate and act upon changes in the environment."

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