As-built schedules contain more than dates when an activity actually started and finished - they also contain that same information for relationships. Relationships have as-built start and finish dates. This gives rise to a different kind of schedule forensic analysis; As-Built Lag Analysis. When the schedule planner decides that a CPM relationship lag other than zero best describes the intended logical relationship between two activities, how often does that given lag actually result in the planned delay between activities? How often does the standard Finish-to-Start relationship with a 0-day lag actually result in a Finish-to-Start with a negative days lag? Is there a pattern in actual usage? How well are planned versus actual relationship lags managed? No one knows because no one measures them. Hundreds of papers have been written about planned versus actual activity durations. How come no one has thought to measure planned versus actual relationship durations? Now, someone has.
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