In many project-based industries, there has recently been an increased tendency for collaboration and cocreation of value with the customers. However, many existing studies report inherent challenges and complexities related to multipartner collaboration. This article presents a conceptual framework that explains the focal collaboration-related elements and their interdependencies in multipartner projects. The elements in the framework and relations between them are derived from the existing empirical studies and theoretical literature on collaboration, knowledge integration, and project success. Based on the conceptual analysis of the extant literature, we identify eight collaboration antecedents and three collaboration outcome elements. The conceptual framework explains how two collaboration mediators, project-collaboration quality and knowledge-integration capability, relate collaboration antecedents with collaboration outcomes. In addition, based on the literature analysis, we identify 15 mechanisms that enhance the project-collaboration quality in multipartner projects. The article provides novel insights on the dynamics of collaboration in multipartner projects by offering the concepts of project-collaboration quality and knowledge-integration capability and explaining their role in collaborative projects.