Introduction: At all levels, effective collaboration between actors with different backgrounds lies at the heart of integrated care. Much attention has been given to the structural features underlying integrated care, but even under structurally similar circumstances, the effectiveness of collaboration varies largely. Theory and methods: Social and organizational psychological research shows that the extent to which collaboration is effective depends on actors’ behaviours. We leverage insights from these two research fields and build a conceptual framework that helps untangle the behavioural processes underlying effective collaboration. Results: We delineate that effective collaboration can be realized when actors (1) speak up about their i...