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 —Value and Percentage S-curves

S-curves may be graphed as absolute values (i.e. Man Hours or Cost) versus Time, or as percentage values versus Time.

Value S-curves

Value S-curves are useful for determining the Project's Man Hours or Cost expended to date, and Man Hours or Cost to complete.

Figure 5: Value Baseline, Actual, and Target Man Hours versus Time S-curves
Figure 5: Value Baseline, Actual, and Target Man Hours versus Time S‑curves

Analysis of the above S-curves reveals the Project as of the 4th of February 2016:

  • Is 10.5 Man Hours behind schedule (48.5 – 38.0)
  • Has grown in scope by 5.0 Man Hours (95.0 – 90.0)
  • Has increased in Duration by 1 Day
  • Started 1 Day late
  • Will finish 2 Days late
  • Will require 57.0 Man Hours to complete (95.0 – 38.0)

Percentage S-curves

Percentage S-curves are useful for comparing the Project's performance to either the Baseline and/or Production Schedule.

Percentage S-curves (Baseline = 100%)

By setting the Baseline S-curve to finish at 100%, the Project's percentage growth (or contraction) may be compared to the Baseline Schedule, and the Baseline % Complete as of the Cut Off Date may be determined.

Figure 6: Percentage Man Hours versus Time (Baseline = 100%) S-curves
Figure 6: Percentage Man Hours versus Time (Baseline = 100%) S‑curves

Analysis of the above S‑curves reveals the Project as of the 4th of February 2016:

  • Has grown in scope by 5.56% (105.56 – 100.00)
  • Was planned to be 86.67% complete

Percentage S-curves (Target = 100%)

By setting the Target S-curve to finish at 100%, the Project's Actual % Complete may be compared to the Target % Complete as of the Cut Off Date.

Figure 7: Percentage Man Hours versus Time (Target = 100%) S-curves
Figure 7: Percentage Man Hours versus Time (Target = 100%) S‑curves

Analysis of the above S‑curves reveals the Project as of the 4th of February 2016 is:

  • 11.05% behind target (51.05 – 40.00)

In Part 2 of this paper, I will describe how an S-curve is generated.

Types of S-curves - Cost vs Time  Types of S‑curves: Cost vs Time
PART 2  PART 2

Home | Issacons | PM Glossary | Papers & Books | Max's Musings
Guest Articles | Contact Info | Search My Site | Site Map | Top of Page