What changed between two Primavera P6 schedule updates?
A schedule comparison should explain more than whether the completion date moved. It should show what changed, where the controlling logic shifted and whether the new forecast is supported by credible progress and schedule maintenance.
Establish a controlled comparison
Use consecutive versions for the same project and confirm the identity, data dates, calendars and coding basis before interpreting movement. Uncontrolled differences can make a technically correct comparison commercially misleading.
Separate progress from structural change
The review should distinguish expected status movement from additions, deletions and revisions to durations, dates, logic, constraints and calendars.
- Activities added or deleted
- Actual and remaining-duration movement
- Forecast and milestone-date changes
- Logic, constraints and calendar changes
Trace critical-path and float movement
Changes in criticality or float may reveal a genuine transfer of control, changed sequencing, inserted constraints or weakened logic. The comparison should identify the affected work areas and explain the likely delivery consequence.
Present management findings
Decision-makers need a concise account of progress achieved, forecast movement, new exposure and required action. Detailed activity-level evidence should remain available behind the summary.
Questions about this assessment
Why compare consecutive updates?
Consecutive updates provide the clearest view of period progress, forecast change and schedule maintenance. Wider gaps may combine several reporting periods and make causes harder to isolate.
Can a completion date remain unchanged while risk increases?
Yes. Float can erode, logic can weaken, near-critical paths can emerge or recovery assumptions can increase even when the reported completion date is unchanged.
Is schedule comparison included with the Schedule Review?
Yes. The Schedule Review includes the health check and comparison of two versions for the same project within the package scope.
Move from guidance to a working example.
The Golden Eagle Sample Project demonstrates the management summary, schedule checks, progress views, resource profiles, quantities and delivery analytics available through the platform.