Social skills training, including assertive training group, has become a recommended therapeutic strategy in substance use disorders. This work aims to evaluate the impact of an assertive training group on several factors: coping strategies, self-esteem and the quality of attachment strategies. In a group of patients with a substance use disorder, we assessed the scores of a coping scale (WCC), a questionnaire to determine the type of attachment (RSQ), an assertiveness scale (Rathus), self-esteem scale (Rosenberg) and depression and anxiety scale (HAD), before and after participating in the assertive training group, which took place from October 2018 to January 2019 in a rehabilitation center in Alfortville. The averages at each scale before and after the group were compared through a Student’s test. 11 patients were included in the study. At the end of the group, there was no significant change in coping strategies, type of attachment or quality of assertiveness. There was an increase in the average selfesteem score of 15,9% (p