Issuing from the classical definitions for the diagnostic sensitivity and specifity of examination methods in multiphasic screenings is deduced that out of the whole methodical spectre of internal specialities only limited parts are to be applied in multiphasic screenings. At the instance of a multiple multiphasic screenings (model study Sternberg '70) ways to the establishment of reduced optimal parameter combinations are demonstrated. With multivariate statistical methods (facotor analysis, discriminative methods) we succeeded in finding parameter combinations for special groups of diagnosis (liver diseases, hypertension and obesity), by means which these groups in multiphasic screenings are clearly to be differentiated from the healthy symptom-free residual population.