Types of S-curves
An S-curve is graphed on an X-Y graph with the X axis representing time, and the Y axis representing a quantity, usually Man Hours or Cost. The three basic types of S‑curves this White Paper will cover include:
- Baseline S-curves
These S-curves are generated from the Baseline Schedule and/or Baseline Fields in the Production Schedule.
- Target S-curves
These S-curves are generated from the Production Schedule, assuming all Tasks are completed as scheduled.
- Actual S-curves
These S-curves are also generated from the Production Schedule, using Task % Complete values to date. Actual S‑curves may also be referred to as Progress or Progress To Date S‑curves.
Each of the above S-curves may represent any of the following on the Quantity (Y) axis:
- Any measurable quantity, such as volume of concrete placed, piles driven, etc.
- Man Hours planned/spent
- Cost budgeted/incurred
S-curve Quantity Units
Each of the above S-curves may use one of the following units for the values on the Quantity (Y) axis:
- Absolute Values for Man Hours and/or Cost
- Percentage Values for Man Hours and/or Cost