Published online by Cambridge University Press: 03 February 2012
Civil Society Organizations (CSOs) play an active role in European and global governance, and many commentators see them as a link that connects the international level with citizens. But not all CSOs active at the international level do have a substantial number of members. The question we investigate in this article is to what extent membership distinguishes these CSOs from other transnational actors. To what extent do member and non-member CSOs differ in their roles and activities? Is it plausible to argue, as it quite often happens, that CSOs with members are more legitimate than others? On the basis of a survey of 60 exemplary CSOs we find that membership CSOs neither differ substantially from non-member CSOs in their political behavior, nor do they differ in important aspects of legitimacy, such as transparency or efforts to include beneficiaries.