In Plain English
Quick Answer
Techniques used to shorten the overall project timeline without cutting any scope of work.
Definition
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.
Context
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
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.
See Also
Related Terms
FAQ
Questions Contractors Ask
What is the difference between crashing and fast-tracking?
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.
Does schedule compression increase project cost?
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.
How do you compress a schedule without cutting scope?
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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