2.2. Sampling

The sample of the study includes 60 men going through methadone maintenance treatment. Sampling was done according to the available samples based on the job complaints that they discussed during the first session of consultation in the addiction treatment centers, and samples were chosen from among 8 methadone maintenance clinics in Bojnurd and introduced by their consultants. After getting permission and confirming that they met the required criteria, the researchers started studying the participants and then randomly divided them into two groups of 30 (i.e., a study and a control group) using computer-generated random numbers for randomization. The intervention process was done in the welfare organization in Bojnurd. The participants took part in the class in groups. The participants were between 20 and 45 years old. The inclusion criteria were starting methadone treatment at least six months prior, the existence of a complaint about a job based on the addicted statement, and being male.