Particpants were recruited from a private,nonprofit agency providing a continuum of care for alcohol and drug use disorders,serving approximately 126 clients per month in both inpatient and outpatient setting.Approximately 57% of the agency outpatient and 2% of inpatient clients are legally mandated to substance abuse treatment,and 19% of outpatient and 75% of inpatient clients are homeless. Roughly 55% of clients complete treatment as recommended. Eligible participants were between the ages of 18 and 70,fluent in English,had completed intensive outpatient or inpatient treatment in the previous 2 week,and were medically cleared