Category: Quantities & pricing
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
An S-curve is a chart of cumulative progress or cost over time. It starts slowly, speeds up mid-project and slows at the end, giving the shape of the letter S.
Why it matters on a project
Comparing planned and actual curves exposes delay early, and it is also used to forecast cash needs.
Measurement and pricing
Produced from a cost- or resource-loaded programme.
Common mistake
Drawing the curve from guessed percentages instead of the actual programme.
Frequently asked questions
What does it mean if the actual curve is below planned?
Progress or spend is behind plan to date, an early sign of delay that needs its cause analysed.
Can Primavera produce an S-curve?
Yes, when the programme is loaded with costs or resources.
Related terms
- Cash flowThe timing of money coming in and going out over the project.
- Baseline programmeThe programme approved at project start against which progress is measured.
- Progress reportA periodic report of what was done, what slipped and why.
- Critical pathThe sequence of activities where any delay delays project completion.
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