A task that must be completed before the next task can start.
A predecessor is an activity that must begin or finish before another activity (the successor) can begin or finish, as defined by the logical relationships in a CPM schedule. The four relationship types are Finish-to-Start (FS), Start-to-Start (SS), Finish-to-Finish (FF), and Start-to-Finish (SF). Correct predecessor logic is fundamental to a valid CPM schedule.
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