Individualizing Incentives for Alcohol in the Severely Mentally Ill

The objective of this study is to determine whether modifications to a CM intervention improve outcomes and reduce costs in heavy drinkers with serious mental illness using alcohol biomarker ethyl glucuronide (EtG) to test of alcohol abstinence. In CM, patients receive tangible rewards for demonstrating drug abstinence. The investigators propose to examine whether 2 strategies - 1. Increasing reinforcer magnitude (High-Magnitude CM) or 2. Reinforcing light drinking before reinforcing abstinence (Shaping CM) - can improve outcomes in heavy drinkers with serious mental illness. The investigators will compare the efficacy of these 2 approaches to Usual CM in heavy drinkers with serious mental illness. A total of 400 participants receiving treatment as usual at 2 treatment agencies will take part in a 4-week induction period. Participants (n=240) who attain a mean EtG \> 349 ng/mL (heavy drinking) during the induction period will be randomized to either a) 4 months of standard-magnitude CM for submitting alcohol-abstinent EtG samples (EtG \< 150 ng/mL) (Usual CM), b) 4 months of high-magnitude CM for submitting alcohol-abstinent EtG samples (High-Magnitude CM), or c) 1 month of CM for submitting alcohol samples that indicate light drinking (EtG \< 500 ng/mL), followed by 3 months of CM for submitting alcohol-abstinent EtG samples (Shaping CM). The primary outcome will be EtG-verified alcohol abstinence during the last 3 months of treatment (when all reinforcement is contingent on abstinence) and during 12 months of follow-up. The investigators will also examine group differences in secondary outcomes, conduct a comprehensive economic analysis, and determine whether variables that make up the NIAAA Addictions Neuroclinical Assessment (ANA) model moderate alcohol abstinence.