The aim of the study is to develop a comprehensive clinical-epidemiological description of the prevalence of generalized anxiety disorders and depression among primary care patients along with an assessment of physicians recognition rates and prescription behaviour. The paper describes methods and design of the study and provides background information on the sampling process and instruments used as well as characteristics of doctors and patients. The study is based on a nationally representative sample of 558 primary care physicians and over 20,000 patients, who attended physicians' offices on the target day. The first stage of study involved a comprehensive description of the physicians characteristics in terms of psychosocial qualification, and provider aspects as well as attitudes towards GAD and depression. In the second stage, all the patients completed a diagnostic screening questionnaire for GAD and depression. In the third stage all patients were characterized by their physicians in terms of their diagnostic status and their past and current interventions.