A computer program for personal computers was developed to support and control the schedule in the operation theatre. With this program a great amount of operational and medical data will be recorded (e.g. the duration of operation and anesthesia, the number of operating rooms occupied, the personnel involved, the diagnosis and surgical therapy). The screen shows up-to-date information about the ongoing events. All data can be easily evaluated for different criteria. In a four years period the program presented has proved valuable for daily routine planning and documentation in a great operation unit.