One key objective of California's Statewide Prevention and Early Intervention (PEI) Student Mental Health (SMH) initiative funded under Proposition 63 was to establish a formal process for ongoing collaboration between higher education systems and county mental health, and to increase collaboration among higher education campuses to improve student mental health. It was believed that with effective collaboration, diverse student bodies in California's colleges and universities would have increased access to a wider array of services, including linkages to local community mental health and substance abuse prevention and treatment partners. In addition, collaboration could foster the collective efforts of campuses to develop, implement, and share innovative and culturally responsive practices and policies, which could further increase the capacity, quality, and efficiency of student mental health programs statewide. As part of its evaluation of activities funded under Proposition 63, researchers from SRI International and the RAND Corporation evaluated the development, quality, and effectiveness of collaboration among SMH program partners in higher education. The current report focuses on findings from collaboration surveys. Overwhelmingly, respondents reported that the advantages of collaboration outweighed the disadvantages. About one-half attributed improvements in SMH outcomes to collaboration, including improved awareness about available SMH supports and increased referrals.Finally, more than one-half of the campus representatives reported that they were planning for sustainability and believed their collaborations would remain strong even after the CalMHSA grant funds ended.