Mutual support groups whose members are individuals who have a diagnosed mental illness which interferes with their functioning in a substantial way in combination with a substance use disorder involving alcohol and/or other drugs which aggravates their ability to become stabilized or recover. The groups meet in-person, by telephone or via the Internet; provide emotional support, information and resources to help participants stop using drugs and/or alcohol and find ways to manage their emotional or psychiatric problems; and may include faith-based and secular 12-step groups as well as non-12 step groups.