The purpose: This study is meant to explore the perceptions of social workers from the municipalsocial services within the cooperation with the regional healthcare, focusing on the psychiatric careunits, and if there are any power relations within this cooperation. Method: A qualitative study with a deductive approach based on semi structured interviews with fivesocial workers in the greater Stockholm area compiled by a thematic analysis of the interviews. Theory: The studies theoretical approach originates from Contingency theory and a power perspectivefrom Theory of Collaborative Advantages Results: The results are presented in four themes; Faults in cooperation, Fragmented welfare, Powerrelations within cooperation and When cooperation is successful. These are summarized by how mostcooperation is successful but certain problems occur such as a lack of communication between theorganizations, vague laws and rules regarding cooperation, a lack of mutual trust and understandingfor each other and an uneven power structure between doctors and social workers. Conclusion: The lack of cooperation is emblematic of the Swedish welfare system's highspecialization and fragmentation meant to cut cost and increase efficiency. It instead leaves clientswith dual diagnosis with no clear direction of who to turn to for help.