Synopsis With the increase in cesarean section delivery cases over the last few years, the care and the management for pregnat women with previous cesarean histories is a problem of primary impotance in obstetrics. It is not desirable to perform further cesarean sectins on a pregnant woman who has aprevious cesarean history using the same uniform and standardised methodology, especially when we considerthe nature of surgical intervention on a maternal body. Furthermore, complete uterus cicatrix

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... (the essential prerequisite of transvaginal delivery by a woman with previous cesarean history) is extremely difficult to evaluate with any high degree of accuracy. Therefore, the best feasible policy to follow at present is to establish certain criteria for selection and to then perform trial deliveries according to these criteria. In our present study, we looked at 170 cases with a history of cesarean section treated over a period of 10 years by the Delivery Section in the Department of Obstetrics at Kyoto University Hospital. Based on the results of this study, three guiding principles are proposed for excluding certain patients (who have a previous history of cesarean section) from trial labor.