This article examines the collective action frames that civil societal actors in Argentina have used while engaging in advocacy. It argues that by devising effective framing strategies, members of civil society organisations increase their chances of participating in the agenda-setting, formulation and adoption phases of policy-making. The relationship between framing and participation is supported by a comparative analysis of two cases of advocacy: the campaign for a freedom of information law and the struggle for child protection legislation. The evidence suggests that civil societal actors often rely on the strength of their ideas and their persuasive power to achieve political relevance, which is analytically distinct from political outcomes.