Why and how to study European solidarity? -- Analytical categories in conceptualizing solidaristic behaviour -- Presentation of cases -- The vertical dimension of Europeanization of the trade union movement -- Interaction and action as transformational mechanisms -- Framing solidarity :...

In this article, we examine the role of institutional context, organizational structures and trade union strategies in tempering membership decline in the number of trade unions in Poland. Empirical data include membership statistics collected for NSZZ Solidarność and 54 affiliates of two...