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A construction project schedule shows the planned sequence of work and the project team’s current forecast for finishing it. To spot delays, compare an approved baseline with a dated progress update, then check which activities are slipping, how much float remains, and whether forecast milestones have moved. A late task is a warning sign—not, by itself, proof that the project completion date will slip or that a particular party caused the delay.
What should you check first?
Start with three details: the approved baseline, the update’s status date, and the schedule version. Without them, a comparison can be misleading. A schedule may show a late finish relative to an old plan, for example, while the current approved target has since changed. Or actual progress may be recorded only through a date earlier than the one you assumed.
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- Find the baseline. This is the approved plan used to measure performance. Confirm which baseline or approved target schedule applies; do not assume the earliest schedule you can find remains the governing comparison.
- Find the status date. Also called the data date, it marks the point through which actual progress has been recorded. Activity progress after that date may be forecast rather than observed.
- Identify the update period and version. Note when the update was issued and the period it covers. Update frequency is controlled by the contract and project requirements, not by one universal rule. For example, the cited federal construction clause provides for monthly updates unless another period is specified in the covered contract; that is not a rule for every project. See Acquisition.gov’s Schedules for Construction Contracts clause.
Write down the schedule name or revision and its status date before drawing conclusions. If available, compare the update with both the approved baseline and the previous update. The baseline shows movement against the plan; consecutive updates help show when a forecast changed and whether the movement continued.
What do the activities and links mean?
Activities are the work tasks or deliverables that make up the schedule. Links, or logic relationships, describe the intended sequence—for example, one activity must finish before another can start. Read the activity list and the links together: dates without credible logic can create a forecast that looks precise but does not reflect how the work must proceed.
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Check whether the schedule covers the work needed to reach the milestones that matter. Depending on the project, that may include design and submittals, reviews, procurement, field work, testing, commissioning, and punch-list completion. A field-work sequence that omits a long-lead item, required review, or closeout work can understate the time needed to finish.
Look for changes to logic and assumptions as well as changes to dates. An activity that has been moved may not be the only reason a milestone moved: its predecessor links, work calendar, constraints, or planned sequence may also have changed. For a comparison between versions, record whether these elements changed and whether the change was approved. Federal schedule guidance emphasizes the importance of a sound, complete schedule and credible progress information; see the GAO Cost Estimating and Assessment Guide and the federal construction schedule clause.
How do you read the activity fields?
Use the activity ID and name to locate the same work across schedule versions, then read progress, duration, dates, and float together. AACE’s schedule-update guidance identifies fields such as original and remaining duration, percent complete, actual start and finish, float, and remarks as useful in an update layout. The AACE Recommended Practice on Forensic Schedule Analysis is a professional reference for schedule analysis; its hosted PDF is not on AACE’s own domain, so treat it as guidance rather than a substitute for the governing contract or project records.
- Original duration: the planned duration assigned to the activity. Compare it with the current remaining duration, rather than assuming the original estimate still represents the work left.
- Remaining duration: the forecast time needed to complete the unfinished work. If progress appears small but remaining duration has not grown—or if significant progress is reported while the remaining duration stays implausibly long—ask what assumptions support the forecast.
- Percent complete: a reported progress measure. Read it with the activity’s actual dates, remaining duration, and remarks; a percentage alone does not explain what work is complete or how it was assessed.
- Actual start and finish: recorded dates for work that has begun or finished. Check actuals against the status date and available project records. A future forecast date should not be mistaken for an actual finish.
- Total float: the schedule’s estimate of how much an activity can slip before a relevant completion date is affected. Read it in the context of the current network and the milestone that matters.
- Remarks or update narrative: explanations for changed dates, progress, logic, or assumptions. A changed forecast is easier to assess when the update explains what changed and why.
For each activity you are concerned about, ask: What was planned by the status date? What actually happened? What work remains? Has the forecast finish changed? What dependent work or milestone does it affect?
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How do you tell whether a late activity threatens completion?
Trace its logic forward and inspect the current critical path and float. The Federal Transit Administration’s January 2025 Project and Construction Management Guidelines defines the critical path as “the longest path of logically connected schedule activities that drive project completion.” The path is a property of the connected schedule, not simply a label attached to whichever task looks most important.
In a schedule with zero float on a critical-path activity, a delay to that activity immediately delays project completion, as the FTA guideline states. An activity with positive float may have some room before it affects the relevant completion date. But float and the critical path can change as work progresses and updates revise durations, actual progress, or logic. A late activity with float can consume that room; if the remaining float reaches zero, it may become critical. Another path may also become the one driving completion.
Therefore, do not infer project impact from one late start or finish in isolation. Review the activity’s current total float, its successors, the current critical and near-critical paths, and the forecast completion milestones. Confirm which completion date the schedule is driving: a project may have contractual, phase, occupancy, or other milestone dates, and an activity’s available float may depend on the relevant date and network.
The Federal Highway Administration’s Guide for Construction Contract Time Determination Procedures discusses CPM scheduling in the context of contract time. Its guidance, like the FTA material, supports using the schedule network to understand how work affects completion rather than treating any isolated late task as proof of a project-wide delay.
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What warning signs suggest the schedule is slipping?
Look for a pattern across dated updates, not just one red or late activity. These signs warrant investigation and validation against progress records, approved changes, and the update narrative:
- A planned start or finish is missed. Compare the planned date with the actual start or finish through the status date, or with the current forecast when work remains incomplete.
- Progress is behind plan at the same status date. Compare planned and actual progress at a common cutoff. Comparing updates with different status dates can make the gap look larger or smaller than it is.
- Remaining duration grows. An activity that needs more time than previously forecast may push dependent work, particularly if it has little or no float.
- Float shrinks or becomes negative. Shrinking float indicates that less time remains before a relevant milestone is affected. Negative float is a signal to inspect the schedule’s date constraints and forecast; it does not, on its own, establish why the date cannot be met or who is responsible.
- Forecast milestones move later. A later completion or phase milestone is a direct change in the forecast. Check whether the change follows from actual progress and logic or from a revised constraint, calendar, or approved scope change.
- Logic or assumptions change. New, removed, or altered dependencies can materially affect the forecast. Ask for the reason, the approval status, and the affected work.
- Progress reports and field records do not agree. If the update’s dates or percentages conflict with daily reports, submittal records, procurement information, or other contemporaneous documentation, resolve the discrepancy before relying on the forecast.
These are indicators, not automatic findings. CPM analysis can help identify activities affecting completion and assess corrective measures, but the conclusion depends on the schedule’s logic, status information, assumptions, and quality. GAO guidance on schedule assessment and the FHWA contract-time guide provide context for evaluating schedules and project time.
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How should you compare two schedule versions?
Compare like with like: identify the version and status date for each schedule, then examine dates, progress, logic, and explanations. A useful comparison covers six areas:
- Baseline dates versus current forecast dates: identify which starts, finishes, and milestones have moved from the approved plan.
- Planned versus actual progress at the same status date: establish whether work was actually behind at a comparable point, rather than comparing unlike cutoffs.
- Original versus remaining duration: see whether the expected time to finish unfinished work has increased, decreased, or remained unchanged.
- Float and driving paths: check total float and whether the critical or near-critical paths have changed.
- Logic, constraints, calendars, and revisions: identify schedule-network or assumption changes that affect the forecast, and distinguish approved changes from unexplained edits.
- Update narrative: read the explanation for variances and changes. Confirm whether it is consistent with the dates, progress, and project records.
Keep a simple comparison log with the schedule revision, status date, affected activity or milestone, previous and current forecast, float change, and stated explanation. This makes it easier to distinguish a one-time forecast adjustment from a trend. It also prevents a later reader from treating a schedule comparison as though it described a different version or cutoff.
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How can you distinguish slippage from responsibility for a delay?
A schedule can show that work or a forecast has slipped; by itself, it does not prove the cause, contractual entitlement, or which party bears responsibility. Those questions require a credible schedule representing the project’s status at the relevant time, sound logic and actual progress, the event’s effect on the then-current critical path, and the contract and contemporaneous records.
For a delay event, the useful question is not merely whether an activity was late in a later update. Ask what the schedule showed at the time of the event, what work was actually complete, which path then drove the affected milestone, how the event changed the remaining work or logic, and whether other conditions or approved revisions also influenced the forecast. A late activity can consume float without delaying completion; a different path can become critical as conditions change.
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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Keep three conclusions separate: observed slippage (what progress or forecast changed), schedule impact (whether and how a milestone was affected in the network), and responsibility or entitlement (what the contract and evidence establish). A schedule is an important analytical record, but attribution may require project records and contract-specific analysis beyond comparing two dates. AACE’s Recommended Practice No. 29R-03 addresses forensic schedule analysis; where a claim or legal conclusion depends on a particular method or requirement, consult the official applicable publication and qualified project or legal professionals.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should you ask when a schedule shows a delay?
Ask for evidence that connects the changed forecast to the current work and schedule network. A focused review can begin with these questions:
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- Which approved baseline and update revision are being compared, and what is each status date?
- Which activities or milestones changed, and what were their prior and current forecast dates?
- What actual progress is recorded, and what project records support it?
- Has the remaining duration changed? What assumptions support the new estimate?
- What is the current total float for the affected activities, and which path now drives the relevant completion milestone?
- Were dependencies, constraints, calendars, or approved revisions changed? What is the basis for each change?
- Does the update narrative explain the movement, and does that explanation match the records?
- What corrective measures are proposed, and which forecast dates or assumptions would they change?
These questions help a project owner, contractor, consultant, or other reader understand what the schedule says without treating the forecast as a complete account of events. If the purpose is contract administration or a delay claim, use the governing contract, jurisdiction-specific requirements, and project records. For example, Caltrans’ construction manual section on prosecution and progress addresses California contract administration; its procedures should not be generalized to projects governed by other requirements.
What are the limits of a schedule review?
A schedule is a model of planned and forecast work, built from activities, durations, logic, calendars, and progress inputs. It is useful for organizing the sequence and tracking movement, but its dates are only as dependable as those inputs and the quality of the update. A schedule may identify a completion risk without explaining every field condition, decision, or contractual issue behind it.
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Frequently Asked Questions
What is a schedule data date in construction?
The data date, often called the status date, is the cutoff through which the update records actual progress. It helps distinguish completed or ongoing work from future forecast activity and makes schedule comparisons more meaningful.
Is a construction look-ahead schedule the same as the project schedule?
Not necessarily. A look-ahead is typically a shorter-range planning view, while the project schedule represents the broader network and forecast; the governing contract and project documents determine which schedules are required and how they relate.
Does negative float mean the contractor is late?
Negative float means the schedule’s calculated dates do not meet a relevant date constraint or milestone under its current logic and assumptions. It is a reason to examine the constraint, network, and contract requirements—not a standalone finding of fault.
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The contract and project procedures specify who must prepare, submit, review, or accept schedule updates. Check those documents for roles and deadlines, since the federal clause and state guidance cited here apply only to their respective contexts.
