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Schedulingaka: crashingaka: schedule recovery

Schedule Compression

In Plain English

Techniques used to shorten the overall project timeline without cutting any scope of work.

Definition

Schedule compression is a broad category of scheduling techniques used to reduce the total project duration without reducing the project scope. The two primary methods are crashing (adding resources to shorten critical path activity durations) and fast-tracking (overlapping activities that were originally planned in sequence). Both methods involve trade-offs in cost, risk, and quality.

Why It Matters in Bidding

Estimators often face a fixed completion date that the natural sequence cannot meet, so compression decisions get baked into the bid through assumed overtime, added crews, or overlapped trades. Pricing those assumptions accurately, and disclosing them, prevents margin erosion and protects against productivity losses when activities are stacked tighter than ideal.

Example

To meet a hard certificate-of-occupancy date, an estimator builds the bid around fast-tracking foundations while design of the upper floors finalizes, then carries a labor premium for the overlapped MEP rough-in that must run concurrently.

Related Terms

Schedule AccelerationFast-TrackingCritical PathResource Leveling

Frequently Asked Questions

Crashing shortens critical-path activities by adding resources such as crews, shifts, or equipment, which raises direct cost. Fast-tracking overlaps activities normally done in sequence, which raises risk of rework and coordination errors rather than direct labor cost. Crashing buys speed with money; fast-tracking buys speed with risk.
Usually yes. Crashing adds overtime premiums, mobilization, and equipment, while fast-tracking can drive rework and lost productivity from congestion. There is a point of diminishing returns where adding crews actually slows progress. Estimators should compare the cost of each compressed day against liquidated damages or early-completion incentives.
Focus only on the critical path, since shortening non-critical activities saves nothing. Apply crashing to the highest-value, lowest-cost-per-day activities first, fast-track where predecessor information is reliable, and resequence work to reduce trade congestion. Always re-run the schedule afterward, because compression often shifts the critical path to a new chain.

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