Various graphic diagrams of obstetrical and perinatological quality assessment between 1984-1986 in the district of Rostock are demonstrated. The advantages of centralization of premature labors are visible. The prenatal diagnosis of intrauterine growth retardation is still insufficient. With an upper cesarean section rate of 10% good perinatological results are achieved. The cesarean section rate of obstetrical departments without high risk concentration is below 5%. There is a highly subjective influence in vaginal operative decision. A mean rate of prematurity may be combined with a high rate of perinatal mortality caused by an unproportional part of very low birth weight infants. The small number of data of the obstetrical basic-check-list allows different possibilities of comparing quality assessment. Different levels of the results and the reasons are better visible by means of graphs. The preliminary results of outcome control justify a general introduction. By means of further data processing we will get better mathematical and graphical interpretations.