Percent Plan Complete (PPC) is the signature metric of the Last Planner System. This simple measurement—the percentage of weekly commitments kept—reveals the health of construction planning and drives systematic improvement. Last planner system software makes PPC calculation automatic and analysis powerful.
What gets measured gets managed. PPC measures what matters most.
Understanding PPC
PPC calculation is straightforward:
PPC = (Number of Commitments Completed / Number of Commitments Made) × 100
If a team made 20 commitments for the week and completed 16, PPC is 80%.
Weekly work plan construction establishes the commitments. End-of-week review determines completion. Lookahead schedule software calculates and tracks the result.
Why PPC Matters
PPC reveals fundamental project health:
Planning reliability: Are plans realistic and achievable?
Constraint management: Is work truly ready when committed?
Commitment culture: Do people make and keep reliable promises?
Coordination effectiveness: Do trade handoffs work?
Construction software tracking PPC exposes these factors clearly.
PPC vs Schedule Variance
Traditional scheduling measures schedule variance—deviation from baseline dates. Last planner system software measures PPC—reliability at the commitment level.
The difference matters:
Schedule variance: Tells you how late you are. Doesn't tell you why or how to improve.
PPC: Tells you how reliable your weekly planning is. Variance analysis tells you why and points to improvement.
Projects can have poor schedule variance with high PPC (difficult schedule) or good schedule variance with low PPC (easy schedule with poor execution). PPC reveals execution quality regardless of schedule difficulty.
Calculating PPC Correctly
Accurate PPC requires clear rules:
Clear commitment definition: What exactly was committed to?
Binary completion: Work is complete or it isn't—no partial credit.
Honest assessment: Completion measured against commitment, not adjusted for circumstances.
Consistent timing: Same cut-off time each week.
Construction schedule app tools should enforce these rules.
PPC by Trade
Aggregate project PPC provides one view. PPC by trade provides actionable insight:
Which trades are reliable? Who consistently keeps commitments?
Which trades struggle? Who needs support or process improvement?
Pattern recognition: Do certain trades have systematic issues?
Crew scheduling software construction organizations use benefits from this trade-level visibility.
Subcontractor management software should track and display PPC by subcontractor.
PPC Trending
Single-week PPC is interesting. PPC trending over time is powerful:
Improvement trajectory: Is PPC getting better or worse?
Consistency: How much does PPC vary week to week?
Milestone correlation: Does PPC drop during critical periods?
Intervention impact: Did process changes improve PPC?
Field management software should display PPC trends clearly.
What PPC Levels Mean
PPC interpretation varies by maturity level:
50-60%: Typical for teams new to Last Planner. Significant improvement opportunity.
60-70%: Better but still indicating constraint management gaps.
70-80%: Good. Most constraint issues addressed but room for improvement.
80-90%: Strong. Reliable planning with systematic constraint management.
Above 90%: Excellent but verify commitments aren't too conservative.
Rolling lookahead schedule processes should target 80%+ PPC.
The Variance Analysis Connection
PPC alone doesn't drive improvement—variance analysis does. For every incomplete commitment:
What was the commitment? Specific work that wasn't completed.
Why wasn't it completed? Root cause of the failure.
Category: Materials, predecessor, labor, equipment, information, weather, over-commitment, etc.
This analysis reveals patterns. Project management software for construction analytics should aggregate and display these patterns.
Common Variance Categories
Last planner system software typically tracks these variance categories:
Predecessor incomplete: Required prior work not finished. Indicates lookahead planning gaps.
Materials: Required materials not available. Indicates procurement or staging issues.
Labor: Required workers not available. Crew scheduling software construction teams use should prevent this.
Equipment: Required equipment unavailable or broken.
Information: Required drawings or clarifications missing.
Weather: Environmental conditions prevented work.
Over-commitment: More promised than could realistically be accomplished.
Quality issue: Work done but didn't meet quality standards.
Change: Scope changed after commitment.
Acting on Variance Patterns
Variance patterns point to specific improvements:
Predecessor issues: Strengthen 3 week lookahead schedule visibility and coordination.
Material issues: Improve procurement tracking and 6 week lookahead schedule identification.
Over-commitment: Train foremen on realistic commitment making.
Information issues: Improve RFI processes and design coordination.
Construction lookahead software analysis should guide these improvements.
Gaming PPC
Teams sometimes game PPC to look better:
Under-committing: Making fewer, easier commitments to hit PPC targets.
Redefining scope: Changing what "complete" means after the fact.
Dropping commitments: Removing work from plans instead of marking incomplete.
Gaming defeats PPC's purpose. Leadership must emphasize improvement over absolute scores.
PPC and Project Outcomes
Research and practice show PPC correlates with project outcomes:
Schedule performance: Higher PPC projects complete closer to baseline schedules.
Cost performance: Reliable execution reduces waste, rework, and overtime.
Safety: Coordinated, planned work is safer.
Quality: Work performed with proper preparation produces better outcomes.
Look ahead schedule construction practices with high PPC deliver better projects.
PPC in Planning Sessions
Weekly planning sessions should incorporate PPC:
Display last week's PPC: Make it visible to all participants.
Discuss variances: Review why commitments weren't kept.
Identify patterns: Are recurring issues evident?
Plan improvements: What will be done differently?
Set expectations: Emphasize commitment reliability for the coming week.
Foreman scheduling app access allows field personnel to see their PPC performance.
Technology Requirements
Last planner system software PPC capabilities should include:
Automatic calculation: PPC computed from commitment completion status.
Multiple views: Project-level, trade-level, phase-level PPC.
Trending: Week-over-week PPC charts.
Variance capture: Easy entry of reasons for incomplete work.
Pattern analysis: Aggregation and visualization of variance categories.
Comparison: PPC across projects or time periods.
Portfolio-Level PPC
Organizations managing multiple projects can use PPC at the portfolio level:
Project comparison: Which projects have strong planning discipline?
Team comparison: Which superintendents and PMs achieve high PPC?
Trend analysis: Is organizational PPC improving over time?
Best practice identification: What do high-PPC projects do differently?
Construction software enterprise features should support this analysis.
Communicating PPC
PPC should be communicated widely:
Project teams: Weekly visibility in planning sessions.
Subcontractors: Understand their individual PPC performance.
Executives: Portfolio-level PPC trends.
Owners: Project-level PPC as indicator of execution health.
Transparency drives accountability and improvement.
Improving PPC
When PPC is low, systematic improvement helps:
Analyze variances: Identify dominant failure categories.
Strengthen constraint management: Improve 4 week lookahead schedule make-ready processes.
Train commitment making: Help foremen make realistic promises.
Improve coordination: Enhance trade-to-trade communication.
Address root causes: Fix the systems that produce failures.
Conclusion
Percent Plan Complete is the metric that makes last planner system software work. It measures what matters—whether commitments are kept—and variance analysis reveals why they aren't.
Weekly work plan construction creates the commitments. PPC measures their fulfillment. Variance analysis drives improvement. The cycle continues week after week, building ever-more-reliable project execution.
Track PPC religiously. Analyze variances systematically. Improve continuously. Results will follow.