Randomization and Masking We recruited seven primary care facilities housing 10 independent care teams (clusters). Three facilities had two teams each, and four had one team. Although staff and providers from different facilities and teams attend role-specific training together and may share managers, each team has unique support staff, providers, and patient panels. We used a blocked design to limit the possibility of patients crossing over from a team assigned to one randomization group to one in the other group (contamination). Because of a negative association between minority race/ ethnicity and depression diagnosis and treatment receipt, we stratified the teams by the race/ ethnicity of the respective patient populations at each facility (plurality Hispanic, non-Hispanic black, or non-Hispanic white). Prior to randomization, we blocked eight of 10 teams into four pairs within strata because they: (a) shared the same facility (three facilities with two teams each); or (b) were from closely located neighborhoods (two facilities with one team each).