Monthly schedule updates are a critical tool for project controls, but they're only valuable if they accurately reflect project reality. Contractors may inadvertently—or intentionally—present updates that obscure delays, manipulate float, or misrepresent progress.

The first step in validation is comparing the update to the baseline schedule. Look for logic changes, duration modifications, and constraint additions that weren't part of the original plan. Each change should have a documented reason and owner approval if it affects the critical path.

Float manipulation is a common concern. Contractors may add constraints or modify logic to preserve their float while eroding the owner's. Review total float reports carefully and question any activities where float has significantly changed without corresponding progress.

Progress claims should be verified against field observations. If a contractor claims 80% completion on an activity, that claim should be substantiated by physical evidence, not just percentage assertions. Implement a consistent progress measurement methodology from project start.

Pay special attention to activities on or near the critical path. Delays here directly impact project completion. Require contractors to provide recovery narratives and revised logic when critical activities slip, and evaluate whether proposed recovery measures are realistic.