A “Predecessor” is an activity that must be completed by the time another activity starts. For example, If Activity A is a predecessor of Activity B, then Activity A must finish at or before the time that Activity B starts plus an ““Offset””. The Offset allows you to specify a minimum separation between activities. If the Offset is negative, it represents the maximum overlap between A and B. An activity may have any number of predecessors. Therefore, a traditional precedence network can be specified such as those found in PERT Charts or Critical Path Models (CPM).
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