درروش مسير بحراني، ديرترين زماني است كه يك فعاليت ممكن است بر مبناي منطق شبكه زماني، تاريخ پايان پروژه و محدوديت‌هاي زماني شروع شود، همچنین به تعاریف early finish date, early start date, late finish date, و schedule network analysis مراجعه شود

In the critical path method, the latest possible point in time when the uncompleted portions ofa schedule activity can start based on the schedule network logic, the project completion date, and any scheduleconstraints. See also early finish date, early start date, late finish date, and schedule network analysis