See what changed between two P6 schedules.
An updated Primavera P6 programme can change in hundreds of small ways. SEQNCS Schedule Explorer COMPARE helps turn two XER revisions into a structured change review.
No account required for FREE tools. Schedule files are parsed in your browser.
Identify the changes worth investigating
Compare a reference schedule with a later update. The analysis highlights additions and removals, milestone movement and changes in relationships that may affect the interpretation of progress or the logic network.
This is a change register, not a conclusion that any change is wrong. A change becomes important when the planning team assesses it against approved scope, status, logic and project context.
- Added and removed activity IDs.
- Movement of matched milestones.
- Relationship changes between matched activities.
Keep the supporting data
SEQNCS provides a FREE comparison PDF with selected examples and a raw Excel download to support a more detailed audit. The PDF is intentionally concise: use the workbook when you need the fuller underlying change population.
Preserving traceability is particularly valuable for programme reviews, update meetings and change-control discussions.
- Review headline changes before looking at the full population.
- Use raw-data Excel to filter and follow up changes.
- Retain copies of both XER revisions outside SEQNCS as source records.
Interpret differences carefully
Activity IDs are important identifiers for revision comparison. If teams renumber, merge or recreate activities, a comparison may classify some changes as additions and removals instead of direct modifications.
Date shifts and relationship changes also require context. The tool is not a forensic delay analysis or an automatic time-impact assessment.
- Keep reference and current revisions clearly labelled.
- Investigate large apparent change volumes for ID renumbering.
- Separate evidence of a change from its contractual significance.
Three steps from XER to insight.
Work from a real schedule export or explore the workspace before using your own project data.
- 01Choose revisions
Open the reference and updated Primavera P6 XER schedules.
- 02Review changes
Examine activity population, milestones and logic differences.
- 03Export evidence
Save the comparison PDF and raw-data workbook.
Frequently asked questions.
Can I compare two XER files for free?
Yes. Schedule Explorer COMPARE and its PDF and raw-data export are part of the FREE tools.
Which differences does SEQNCS identify?
It reports categories including added/removed activities, milestone movement and relationship changes, based on the data represented in the source exports.
Is schedule comparison the same as delay analysis?
No. Differences between revisions are evidence for review, not proof of delay causation, entitlement or responsibility.
What happens if activity IDs change?
Unstable identifiers can weaken activity matching. Inspect additions and removals closely when a schedule has been renumbered.
Put schedule evidence to work.
Use focused tools for schedule quality, exploration, comparison and short-term construction planning.