Objectives: The VA Network 5 and 22 Mental Illness Research, Education, and Clinical Centers (MIRECCs) developed a web-based system that provides computerized counseling regarding diet to individuals with SMI. The proposed project expanded this system. This project's objectives are to: 1) develop a comprehensive web-based system that delivers MOVE! using design features that meet the needs of individuals with mental illness; 2) evaluate the effectiveness, in patients with serious mental illness, of web-based MOVE! compared with in-person MOVE! and a control group; and, 3) characterize, from the patient's perspective, the strengths, weaknesses, and barriers to the use of in-person and web-based MOVE!.