Negative Lags - Relationships with a Lag Duration of Less Than 0 Section of the Schedule Check Report Dialog Box

Overview

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

  • The relationship between two activities. See About Relationships for more information on relationship types.

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

  1. Click "" Projects.
  2. On the Projects navigation bar, click "" Activities.
  3. On the Activities page, click the Actions menu and select Run "" "" Check Schedule....
  4. In the Check Schedule dialog box:
    1. Select the Negative Lags - Relationships with a lag duration of less than 0 option.
    2. Click Check Schedule.
  5. In the Schedule Check Report dialog box, expand the Negative Lags - Relationships with a lag duration of less than 0 section.

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