Introduction and objective: Alcohol addiction is a disease that must be treated and clubs of alcoholics in treatment (CAT) are among the most well-known forms of post-hospital treatment. The goal of the research was to get an insight into the factors that contribute to the personal change of people who are being treated for alcohol addiction, and who are involved in the activities of CAT, and to determine the factors that contribute to improving the lifestyle of abstainers with reference family support in the process of abstinence. Methodology: The research included a total of N=163 people addicted to alcohol who were registered as members of Clubs of alcoholics in treatment from Bosnia and Herzegovina. Participants aged 20 to 65 took part in the research. The research population of this study consisted of people who regularly come for treatment to the Clubs of alcoholics in treatment of both sexes, who come to the meetings at the CAT based on a personal decision or based on the decision of the Court, and who come to the CAT for at least three months. The measuring instruments used in the research are: Questionnaire of sociodemographic and treatment characteristics, constructed for the purposes of this research; Scale of perceived self-efficacy in abstinence (shortened version) (Brief Abstinence Self-Efficacy Measure, BASEM), (Patrick McKiernan et al., 2011); Personal Wellbeing Index scale for adults, (eng. Personal Wellbeing Index–Adult), (Cummins, 2013); The Recovery Assessment Scale, (Giffort et al., 1995); Helping Alliance Questionnaire (HAQ) - Patient version, (Luborsky, 1987); The Group Climate Questionnaire (GCQ), (MacKenzie, 1983); Group engagement measure (GEM), (Macgowan, 2000); ICPS Family Functioning scale (Noler, 1988); The Multidimensional Scale of Perceived Social Support, MSPSS, (Zimet et al., 1988); Perceived Stigma of Addiction Scale, PSAS (Luom et al., 2010). Results: The average length of attendance at CAT meetings was 33 months (M=32.82; SD=34.58), with fairly high standard deviations. In total, the estimates of the helping relationship with therapist are high on both factors, with the fact that there is a slightly higher agreement with the fact that there is trust and understanding with the therapist (M=5.3, SD=0.769) compared to the factor Shared orientation of the user with the therapist on the treatment goals (M=5.00, SD= 0.892). Users highly value user engagement in group work (M=4.49; SD= 0.909). The overall level of involvement in group work is high and amounts to M=4.31 (SD=0.739). Family support was shown to be highly significant in the research during the treatment of alcohol addiction, where the factors attachment and support of family members were singled out, for which M is 4.39 while SD is 1.074 and family functionality (M=4.65, SD= 1.165). The factor inconsistency of family relationships, which refers to autonomy within the family, shows M=3.46 and SD=1.161, while the factor rigidity among family members in KLA shows M=3.77 and SD=1.183. The overall results of the analysis for perceived family support are M=5.52 and SD=1.319, while for perceived support from friends, M=5.31 and SD=1.487. According to the results of the research, stigma is somewhat present, so the participants agree to the greatest extent that society is ready to accept a person undergoing treatment as a close friend (M=2.86), and to the least extent ready to accept a person undergoing treatment for alcoholism as a teacher of small children in a public school or to do jobs that include childcare (M=2.50 and M=2.48). Outcomes of alcoholism treatment were measured through three variables: perceived self- efficacy, personal well-being and assessment of recovery. The results we obtained in the part related to the Perceived self-efficacy of KLA users show that M is 4.00 while SD is .870. Within this variable the factor safety of KLA users in non-consumption in case of craving for alcohol stands out as particularly significant, where M is 4.28 and SD is 1.135 where the participants showed a high degree of self-efficacy and confidence in their decision to maintain abstinence. The results on the personal well-being of the research participants show that M = 7.653, while SD = 1.852 indicating solid average assesments. The respondents tend to have more positive values of the arithmetic mean on all four factors of recovery assessment, on the basis of which it is immediately possible to infer that the clubs of treated alcoholics contribute positively to the assessment of recovery from addiction about alcohol in the tested sample. They rate their recovery the highest in the domain of positive expectations for the future and orientation towards success (M=4,23, SD= 0,681), and the lowest in the domain of overcoming the symptoms of addiction itself (M=4,06, SD=0,839), which indicates more directly recovery in the form of healing. Other observed factors were Recovery management and reliance on other people (M=4.21, SD= 0.67) and Orientation towards success and goals (M=4.27, SD=0.685). According to the first research problem on the perceived self-efficacy of CAT users, the obtained results indicate that the majority of research participants say that in the process of treating alcohol addiction, the relationship they have with the therapist or leader of CAT is particularly important to them. Based on the analyzed data and obtained results, we can state that people who evaluate the relationship with the therapist as better, are more involved in the work of the group and evaluate the group climate as better, also show greater self-efficacy in abstinence. The results of the research and analysis of the second research problem, which was related to the personal well-being of users of CAT, suggest that the marital status of the participants, the total period of abstinence, group climate, engagement and perceived family support have a significant contribution to the personal well-being during the treatment of users of CAT, and such a model explains a total of about 44% of the variance. The results of the third research problem related to the explanation of the assessment of recovery indicate the following: sociodemographic characteristics for none of the dimensions of recovery proved to be a significant predictor. The exception is the male gender, which contributes to the Self- confidence and positive expectations dimension. The characteristics of the treatment are also generally not significant for explaining the assessment of recovery, except for the Self- confidence and positive expectation dimension, the absence of another mental illness is significant. For all dimensions of recovery, the features of the helping relationship with the therapist and the level of involvement in group work are important. Aspects of family functioning and social support are important for all dimensions of recovery assessment. The perception of stigma of persons undergoing alcohol addiction treatment did not prove to be a significant predictor for explaining the dimensions of recovery. Conclusion: Based on the analyzed, interpreted data and obtained results, we can state that people who evaluate the relationship with the therapist as better are more involved in the work of the group and evaluate the group climate as better, and that they also show greater self- efficacy in abstinence. A previous diagnosis of mental illness as well as longer abstinence, i.e. the absence of relapse, contribute to the explanation of the criterion variable. The results show that people who rate their relationship with the therapist as better also report greater personal well-being in the treatment process. People who report a higher level of family functioning and greater social support report greater personal well-being from the alcohol addiction treatment process. Research has shown that people who rate the relationship with the therapist as better report higher assessments of recovery. A higher number of abstinent relapses during treatment for alcohol dependence tends to influence the lower assessment of recovery in some aspects of recovery, such as, for example. overcoming challenges. Based on the interpreted results of the research, we can conclude that people who report a higher level of family functioning, i.e. higher perceived social support, also show higher assessments of recovery. The scientific contribution of this research is primarily reflected in the understanding of the phenomenon of the process of treating the disease of alcoholism in our case through treatment in the Clubs of alcoholics in treatment. The practical contribution is also reflected in the fact that the results of the research will serve us for the purpose of improving the approach to group therapeutic work with people undergoing treatment within the CAT with the use of the obtained results of this research with a focus on application in the practice of the work of the CAT in Bosnia and Herzegovina.