RecruitingBehavioural interventionComparative Effectiveness of IIMR Versus CDSMPThe study will enroll 600 people with serious mental illness who receive services at Centerstone in KY or TN and will compare two different evidence-based self-management interventions: Integrated Illness Management and Recovery (I-IMR), a program developed by the study team at Dartmouth that trains people with serious mental illness on physical and mental health self-management, and the Stanford Chronic Disease Self-Management Program (CDSMP), a program largely focused on physical health self-management that has been used widely in the general population.