Rönnberg, S.(1991). How effective is the treatment of alcohol problems? Nordisk Psykologi, 43, 37–51. Four different perspectives on the evaluation of treatment of alcohol problems are discussed: Controlled group studies, consequences of basic models of behaviour influences, clinical impressions, and the effects of treatment on macro levels. It is argued that research on the effects of care and treatment of alcohol problems should be adapted to the level of knowledge in the subject matter. When knowledge is scant in the field qualitative research is required. When basic clinical knowledge is achieved, experimental single case studies is recommended for studying the process. Experimental group studies of the effects of well-defined methods on samples of special populations are recommended when an advanced knowledge exists in the subject matter. Broad evaluation of social programs is best done when there is a firm ground of researched knowledge of individuals and groups with alcohol problems.