S Wave is a method of schedule or progress control tool that shows the growth of a variable (progress) in terms of another variable (time). A display of cumulative progress (or costs, labour hours or 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.
