The original version of this paper was published here in May 2009:
See s-curve/intro.htm

This 4th Edition was submitted for publication in January 2019.
It is copyright © Midori Media.
Published here July 2019.
Editor's Note and Introduction | What is an S‑curve? 
Types of S‑curves — Baseline, Target, Actual, Man Hours vs Time
Cost vs Time | Value and Percentage | PART 2

Types of S-curves —Man Hours versus Time S-curves

Man Hours versus Time S-curves are appropriate for Projects that are labour intensive. It shows cumulative Man Hours expended over time for the duration of the Project. As Man Hours are a product of Man Power and working hours, these may be adjusted together or individually in an attempt to keep the Project on track. Projects may require additional Man Hours to finish on time due to low productivity, weather or other delays and disruptions, rework, variations, change of scope, etc.

Types of S-curves - Actual  Types of S‑curves — Actual
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