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Early finish date â adding duration to the early start date. Latest start date. Latest finish date â adding duration to latest start date. Slack time â difference between latest start date and early start date or between latest finish date and early finish date.
Early start date (ES). In the critical path method, the earliest possible point in time when the uncompleted portions of a schedule activity can start, based on the schedule network logic, the data date, and any schedule constraints. Early finish date (EF). In the critical path method, the earliest possible point in time when the uncompleted portions of a schedule activity can finish, based on the schedule network logic, the data date, and any schedule constraints. Late finish date (LF).