Social characteristics of patients and institutional characteristics have only a marginal impact on the indication of invasive cardiologic procedures. A trend toward "overdiagnostics" within the group of younger patients has been noticed, even in the case of missing hard medical evidence. A serious deficit of health care research can be found. Consented criteria to assess the appropriateness of medical treatments are missing. More research has to be done in the field of concepts and processes controlling the distribution and movement of patients into different sections of the health care system. Validated, standardized and comprehensive data for an international comparison of decisions about medical treatments are needed.