I don't think i'm fully understanding the s curve and why you'd want to do it.
Does the plan for example need to be baselined?
The S curve is a very powerful graphic tool for comparing your planned vs.
your actual progress. When EVA is added, it's one of the best ways to track
a project. For this to work, it does need to be baselined.
An S curve can be based on dollars (budgeted, committed or spent),
manhours, or any of a number of other indicators like rebar, concrete,
structural steel, pipe, electrical conduit and so forth. These things can
be very reliable indicators of how a specific portion of a job is going.
The key here is that any deviation from the baseline is assumed bad until
proven otherwise. Never assume things are going well because your Actual
curve is above your planned curve. Check to see exactly why it's happening.
The best way to understand it is to use it.
Hope this helps in your world.