Negative Lags - Relationships with a Lag Duration of Less Than 0 Section of the Schedule Check Report Dialog BoxOverview Use this section to identify relationships with negative lags. Negative lags can affect critical path and distort total float. When activity durations change, activities with negative lag can be scheduled unrealistically. Negative lags can be used to schedule overlapping activities. For example, when digging a trench, workers can start laying pipe in the completed sections of the trench while the rest of the trench is still in progress. To avoid the distortion that negative lag can cause, you might consider using positive lag on a Start to Start relationship rather than a negative lag on a Finish to Start relationship. Only a subset of all the internal and external links in the open projects are checked. Any links between activities that both have actual finish dates are removed from the subset to create the list of links checked for negative lag. The Actual percentage is calculated as the number of links found that match the check divided by the total number of subset links checked. Screen Elements Predecessor Project ID field The identifying code for the project containing the predecessor activity that failed the check. Predecessor Activity ID field The identifying code for the predecessor activity that failed the check. Predecessor Activity Description field The brief description of the predecessor activity. Relationship Type field
Lag Duration (hours) field The number of hours of lag duration. Successor Project ID field The identifying code of the project that contains the successor activity. Successor Activity ID field The identifying code of the successor activity. Successor Activity Description field The brief description of the successor activity. Getting Here
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