Learning Center

Scheduling and claims, explained in depth.

Guides on construction scheduling, the critical path method, and the contract and legal fundamentals behind a delay claim.

• Construction Scheduling History & Terms Guide

  How construction scheduling evolved from Gantt charts to CPM, PERT, and P6 -- plus the core terms every scheduler and claims analyst should know.

• Critical Path Method Example: A Step-by-Step Walkthrough

  A step-by-step worked example of the critical path method: forward pass, backward pass, total float, and how to find the critical path in a CPM schedule.

• Why Your Project Schedule Is a Legal Document

  Courts treat the CPM schedule as key evidence in delay disputes. How delivery method shifts scheduling risk, and what two real court cases teach about notice.

• How to Read a Primavera Baseline Schedule Report

  A field-by-field walkthrough of a Primavera P6 baseline schedule report, and how its built-in warnings map directly to a DCMA 14-point health check.

• The Complete DCMA 14-Point Assessment Explained

  All 14 DCMA schedule health checks explained with pass/fail thresholds -- plus a worked example of a real schedule failing four of them, and how each failure gets fixed.

• Concurrent Delay: How to Actually Test for It

  A worked two-activity example showing how to test for true concurrent delay -- not just two delays in the same time period -- and how apportionment plays out once concurrency is confirmed.

• What Is an XER File? Structure and Comparison Pitfalls

  How a Primavera P6 .xer file is actually structured -- its tab-delimited tables -- and why activity ID reuse and renames can quietly break a naive schedule comparison.

• CPLI and BEI Explained, With Formulas

  The exact CPLI and BEI formulas from the DCMA 14-point assessment, what values above and below the healthy threshold mean, and one schedule run through both calculations.

• Reading a P6 Schedule Comparison Report, Line by Line

  An annotated walkthrough of a schedule comparison report: what 'value not specified in the database' means, how changed vs. unchanged rows are marked, and how relationship and lag changes actually render.

• Windows Analysis: Splitting a Schedule Into Delay Periods

  A 210-day project split into four windows, each with its own critical path and delay-day attribution -- the real methodology behind windows (time slice) analysis.

• Time Impact Analysis, Step by Step

  A 13-activity baseline, one owner-caused delay modeled as a fragnet, and the recalculated network showing exactly how much time extension results -- worked step by step.

• But-For Delay: Reconstructing the Project Without the Delay

  A fictional project reconstructed without one specific delay event, showing the resulting but-for completion date against the actual date -- and the delay attributable to that event.

• Collapsed As-Built, With a Real As-Built Schedule

  A real as-built schedule with one delay event collapsed out and the network re-linked, showing the hypothetical earlier finish date and the resulting delay in days.

• Impacted As-Planned vs. Time Impact Analysis

  The same fictional project run through both methodologies -- inserting the same delay event into the unprogressed baseline versus the contemporaneous update -- and why the results differ.

• As-Planned vs. As-Built: Reading the Variance Correctly

  Why an activity finishing late doesn't always mean the project was delayed -- float absorption versus real delay, worked through two contrasting example activities.

• Measured Mile Analysis for Loss of Productivity

  How to measure lost labor productivity by comparing an unimpacted period's real production rate against an impacted period's -- worked through a pipe-installation crew example.

• Pacing Delay: What It Looks Like in a Schedule

  What legitimate pacing delay looks like in schedule data -- a deliberate, documented slowdown in response to someone else's excusable delay -- and how to tell it apart from an after-the-fact excuse.

• The SCL Protocol, Method by Method

  A plain-language guide to the Society of Construction Law Delay and Disruption Protocol's recognized delay-analysis methods and when each is meant to be used.

• AACE RP 29R-03, Illustrated

  A visual decision-tree walkthrough of AACE International's forensic schedule analysis recommended practice, with a mini-example on each branch.

• Why Native Schedule Comparison Can Miss Calendar Changes

  A calendar edit can shift a dozen activities' dates without changing a single one of their own fields -- why comparison tools need to diff calendars, not just activities.

• WBS Rename False Positives in Schedule Comparison

  Why comparing Work Breakdown Structure nodes by internal ID instead of name can report a whole section of the schedule as deleted and rebuilt when nothing actually changed.

• P6 Professional Standalone Can't Run Schedule Comparison

  Why the desktop, standalone edition of Primavera P6 Professional has no built-in schedule comparison tool, and what that means for anyone who receives .xer exports without EPPM access.

• Float Erosion and Negative Float: Early Warning Signs

  Float doesn't usually disappear in one dramatic update -- it erodes steadily across several. Tracking that trend catches trouble before any activity actually goes negative.

• Open Ends and Logic Gaps Explained

  An activity with no predecessor or no successor can't have a real early or late date calculated for it -- what open ends actually break in a schedule.

• HTML vs. CSV vs. ASCII Comparison Output

  Why a comma-separated export of a schedule comparison so often garbles in Excel, and what actually goes wrong -- names with real commas, quoting rules, and encoding.

• Multi-Update Schedule Tracking: Why Two-File Comparison Isn't Enough

  A single before/after comparison can hide exactly when and why a delay happened across a real project's dozen-plus monthly updates.

• Why Your Gantt Chart Isn't a Schedule

  A Gantt chart is a picture of a schedule, not the schedule itself -- two nearly identical-looking Gantt charts can have completely different underlying logic and critical paths.

• The Hidden Bugs in Your P6 Schedule

  A lighter tour of the structural problems that quietly undermine a P6 schedule's reliability -- open logic gaps, hard constraints, excessive lag, and implausible float.

• What Total Float Actually Tells You About Risk

  Float isn't just a scheduling number -- it's the schedule's own early-warning system for risk, and unusually high float can be a red flag rather than genuine safety margin.

• CPM vs. Lean Pull-Planning: Which Should Your Project Use?

  How CPM's top-down network logic and lean pull-planning's collaborative, short-interval approach differ -- and how real projects often use both together.

• How to Compare Two Schedule Updates Without Losing Your Mind

  The real manual process people use to compare two P6 updates by hand -- sorting, matching rows, cross-checking relationships -- and exactly where it breaks down.

• Schedule Analytics vs. Scheduling Software: What's the Difference?

  Scheduling software builds and maintains a schedule; schedule analytics tools analyze one that already exists -- two genuinely different categories that solve different problems.

• Reading a Baseline Schedule Like a Forensic Analyst

  Part 2 of the baseline report guide: what a forensic analyst specifically looks for before trusting a baseline as the reference point for a delay claim.

• Earned Value Metrics Cheat Sheet

  PV, EV, AC, SV, CV, SPI, and CPI defined with exact formulas and a worked example -- plus why SPI and CPLI measure genuinely different things.

• Modeling a Multi-Activity Fragnet in a Time Impact Analysis

  When a delay event is a sequence of activities, not one lump of time: how to build a linked fragnet, why series and parallel branches delay a project differently, and why calendar days can exceed working days.

• Why a Collapsed As-Built Can Show a Negative Delay

  A collapsed as-built that says removing a delay made the project finish later is telling you something about the schedule, not the delay. Why real actual dates rarely rebuild from logic alone, and how to measure the delay fairly.

• Every DCMA-14 Check Explained, One by One

  The 14 checks in the DCMA schedule assessment: what each measures, its threshold, how Claims Digger calculates it, why it matters, and how to fix a failure.