Aims: The main aim of this study is to analyse the dynamics in self-regulation functions in connection with the treatment of people with alcohol addiction. Another goal is to compare two groups of people after a period of 1 year: those who maintained abstinence and those who relapsed. Method: The studies were designed as longitudinal studies (three assessments) with quasi-experimental procedure (without a control group). The first assessment was performed during a 2-week period of treatment, the second one was performed at the end of the basic stage of treatment and the third one after 1 year. The data were collected in 12 centres treating addictions with similar treatment programmes on a group of 977 patients with a diagnosis of alcohol addiction (males 76%, females 24%). Self-regulation functions were assessed with Inventory SSI-K, where they are defined based on Kuhl’s Personality Systems Interactions theory. A semistructured interview was performed twice: at the beginning of treatment, in order to diagnose alcohol addiction disorders, and after 1 year of treatment, to analyse the indicator of recovery, which was defined as maintaining abstinence. In the evaluation of the dynamics of self-regulation functions, a two-way analysis of variance (ANOVA) was used. Conclusions: Treatment and abstinence influence changes in self-regulation functions. The effects of these changes are mainly observed in people who maintained abstinence 1 year from starting their treatment, which indicates a stronger ability to act according to their own needs, facilitating the development of the ‘Self’.