This work manual compiles both the theoretical foundations and all necessary materials to optimally conduct individual or group sessions within the framework of a comprehensive treatment plan. It does not aim to provide a comprehensive and exhaustive presentation of gambling addiction in general, but rather to support therapists in clinics or practices. Therefore, the numerous worksheets and checklists that therapists can work with directly are particularly valuable. This saves a lot of preparation and the development of one's own materials; moreover, one can rely on a thoroughly evaluated therapy program.