If an uncompleted activity’s predecessors are all complete, then it would be reasonable to expect that the activity in question should be in progress. The possible exception is when a predecessor completes just prior to the Data Date allowing the successor activity status to be “not started”.
In any event, not started activities without active predecessors should be examined further to determine if the status should be updated or if a logic revision is required.
Zümmer Analysis Report #25 – “Not Started Activities with No Active Predecessors” lists all activities that:
a) have not started and;
b) the “immediate” predecessor(s) are all complete.
The column titled “ES Var To Data Date” lists the variance between the activity’s Early Start (ES) and the Data Date. If the variance is small or Zero, then this is typically an indication that the activity is “Riding the Data Date”; (meaning the Data Date is controlling the ES for the activity). If the variance is large, then this is typically an indication that the activity is restrained (commonly by the Retained Logic Rule) by an uncompleted “distant” predecessor.
Upon review of the schedule logic shown above and in the illustration below:
Line Item #1, Activity A1040, with and ES Variance =0, is “Riding the Data Date” and its immediate predecessor, A1020 – Activity B is complete.
Copyright ©2019 FoxQuest Systems, Inc. – All Rights Reserved