[Excerpt]This report presents the end-of-project impact evaluation for the project Strengthening Protections of Internationally Recognized Labor Rights in Colombia. The project is designed to address Colombian workers’ lack of access to safe mechanisms through which they can address workers’ rights violations. The main purpose of this evaluation was to estimate the impact of CAL services on workers’ labor-related complaints and their resolution and on CAL clients’ knowledge of their labor rights. Although the specificity of the population targeted by the program and by the evaluation means that the results of this study may not be readily applicable to other contexts, the issues raised are potentially relevant in many contexts.