S Curve is a progress control tool and method of the schedule control and management that shows the growth of a variable (progress) in terms of another variable (time). The S Curve displays the cumulative progress, costs, labour hours, other quantities plotted against time. The name derives from the S-like shape of the curve, flatter at the beginning of the project and the end of the project, and steeper in the middle, which is typical of most projects. The beginning represents a slow and low progress performance, but accelerated after the project operation system is ready, while the end represents a deceleration as the low efficiency of work.
Related Definitions in the Project: The Project Schedule; Project Controls; Project Management
