When construction work is done out of sequence, first make the schedule reflect what actually happened; then decide whether the remaining work still depends on the predecessor shown in the CPM network. Set a valid status date, verify actual progress and remaining durations with the field team, and investigate each broken sequence. Retained logic or progress override can change the forecast, but neither setting proves that the revised work sequence is physically feasible.
What “out of sequence” means in a construction schedule
Work is out of sequence when progress occurs in a different order from the order represented by the schedule logic. For example, a successor may start before a finish-to-start predecessor finishes, start before a start-to-start predecessor starts, or finish before a finish-to-finish predecessor finishes. That progress may be workable, but it is a reason to check whether the original relationship still describes the work that remains.
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Keep schedule statusing separate from schedule revision. Statusing records actual events and updates the forecast for unfinished work. Revising changes the future plan, such as the activity sequence or durations. Use a valid status date for the reporting period; the date a schedule is viewed or saved is not a substitute. Unfinished work should not remain forecast in the past after an update. See the U.S. Government Accountability Office’s Schedule Assessment Guide for schedule-update guidance.
How to recover the schedule step by step
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Set the status date and establish actual progress
Confirm the data date and reporting period. Ask activity owners and field leads for actual starts and finishes, work accomplished or actual duration, and a realistic remaining-duration estimate. Preserve the approved baseline and earlier updates so the team can identify and explain changes.
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Identify and investigate each out-of-sequence activity
Record which predecessor relationship was violated. Check whether that predecessor remains a physical or logistical requirement for unfinished work, whether only a separable portion could proceed, and whether the field team has adopted a different execution plan. Do not delete or weaken logic solely to improve forecast dates.
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Choose logic that matches the remaining work
With retained logic, an activity that started early waits for its predecessor before continuing. With progress override, it can continue despite the original predecessor relationship. These treatments produce different forecasts; neither replaces a field check. GAO describes retained logic as generally more conservative and generally preferred, while calling for case-by-case review and schedule logic that reflects the actual order of work. See GAO’s guidance on schedule logic.
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Recalculate and test the forecast
Review projected completion, the critical or longest path, milestone dates, float, resource loading, and any new constraints. An earlier date under progress override may depend on changed logic and sufficient added resources. In GAO’s illustrative interior-finish example, an apparent one-working-day gain required four carpenters on days when the original plan assumed two for each concurrent task. That is an example, not a general productivity benchmark.
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Build a feasible recovery plan for the unfinished work
AACE describes recovery scheduling as planning to recover lost time, commonly through resequencing logic, adjusting available work time, or adjusting activity durations. Evaluate any proposed measure against available labor and equipment, procurement, access, safety, quality, and physical constraints. A shorter duration is not a workable recovery plan unless its execution and resource assumptions are supportable. AACE’s Recommended Practice 54R-07 covers recovery schedule preparation and assessment; AACE notes that its recommended practices are guidance, not mandatory standards: AACE Recommended Practices.
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Document the revision and monitor results
Explain which logic or durations changed, why the sequence is feasible, what resources it assumes, and the resulting completion-date and float effects. If the contract includes the cited GSA construction clause, it calls for a written narrative describing the substance and rationale of schedule revisions and their impact on projected substantial completion and available float. The basic clause calls for weekly updates unless another period is specified, and alternate clauses differ. Check the actual contract language to establish the project’s requirements: FAR 52.236-15, Schedules for Construction Contracts.
Retained logic or progress override?
| Decision point | Retained logic | Progress override |
|---|---|---|
| Predecessor dependency for remaining work | Keeps the relationship in force; unfinished work waits for predecessor completion. | Allows work to continue despite the original predecessor relationship. |
| Forecast effect | May show a pause and later resumption; generally more conservative. | May show earlier completion or parallel work. |
| Resource implications | Does not itself imply an increase in resources. | Check that crews, equipment, access, and supervision can support parallel work. |
| When it may fit | The original physical or logistical dependency still applies to unfinished work. | Field evidence supports a changed dependency or sequence, and the network is repaired to represent it. |
These are calculation treatments, not conclusions about responsibility or entitlement. Have the scheduler and activity leads review each occurrence and record why the selected logic matches the work. GAO’s preference for retained logic is qualified: its guide also recommends examining individual cases and repairing logic to reflect actual progress.
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Questions to resolve before accepting a recovery forecast
- What was the valid status date, and what work was actually complete by then?
- Did the activity become independent of its predecessor, or did only a separable portion proceed?
- Does the revised sequence require more labor or equipment than the current resource plan provides?
- After correcting the logic, which activities control the forecast milestone and completion date?
- Which recovery measure is feasible for remaining work, and what resources and working time does it require?
- What revision narrative, update interval, and review process does the contract require?
What the schedule update can—and cannot—establish
A corrected schedule can show the forecast based on recorded progress, logic, durations, and stated resource assumptions. It does not by itself determine delay responsibility, entitlement to a time extension, or compensability. Those questions depend on project records, contract terms, and qualified project-specific review. GAO’s guide is public-sector scheduling guidance, not a project-specific contract or substitute for the project’s scheduling specification.
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