Trace Logic
Trace Logic enables you to step forward or backward through a sequence of activities to focus on predecessor/successor relationships.
Trace Logic, which is displayed in the lower layout, represents relationships for an activity you select in the Activity Table, Activity Network, Activity Usage spreadsheet, or Gantt Chart currently displayed in the upper layout. A red border around an activity box indicates a critical activity. A line connecting activity boxes indicates an activity relationship.
Use the Trace Logic layout to
- Examine an activity and its predecessors and successors
- Determine why an activity is scheduled at a particular time, answering questions such as: Were any of its predecessors delayed? Do any of its predecessors or successors have an obsolete constraint? Are two activities that should be linked start to start currently linked finish to start? Why is there negative float?
Tip
- Zoom in or out without affecting the level of detail displayed in the upper layout.
- Choose View, Bottom Layout Options or click the Display Options bar and choose Bottom Layout Options to specify how many levels of predecessors and successors you want to view.
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Last Published Tuesday, March 31, 2026