In the United States, 5.6% of individuals live with a serious mental illness (SMI), which includes diagnoses of schizophrenia, depression, and bipolar disorder.2 Although this population often lives in the community, they are often not part of the community. High levels of depressive symptoms only worsen the likelihood of community participation.19, 20 Our proposed intervention, Switch, will focus on the domain of community living and participation by strategically combining several evidence-based practices using behavioral activation approach. The initial goal is to increase activity and precursors to participation based on each participant's values ensuring early success. This will produce an increase in positive feelings which, in turn, will reinforce the increased engagement in activities. This will build behavioral momentum toward higher-effort activities and the goal community participation. When combined, the components of the intervention will also support self-management and habit formation. The first six months of the project will include preparation (e.g., hiring, staff training, recruitment). Intervention implementation will start halfway through the first year and ending halfway through the third year for a total of 2 years. Four cohorts of 13 participants (52 total) will be enrolled in the study for 26 weeks (4 weeks of baseline, plus the 22-week intervention). The final six months of the third year will be used to analyze data and prepare manuscripts and presentations for dissemination. The anticipated outcomes include evidence of the efficacy and acceptability of study and intervention procedures and identification of factors (e.g.,environmental variables) that facilitate or impede community participation, both of which align with NIDILLR's definition of the efficacy stage of research.