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 September 2019.

PART 2 | Worked Example | Generating Percentage S‑curves
Using Task Duration as a Quantity | PART 4

Generating Percentage S-curves

Percentage S-curves may be generated by dividing the Year To Date (YTD) daily totals for each Day for each S‑curve (Baseline, Actual, Target) by either the total Baseline Man Hours (Baseline = 100%) or Target Man Hours (Target = 100%).

Generating Percentage S-curves (Baseline = 100%)

To generate Percentage S-curves with the Baseline = 100%, divide the Year To Date (YTD) daily totals for each S‑curve by the Baseline total Man Hours for each Day of the Project.

  • Baseline YTD % = Baseline YTD Total / Baseline Total Man Hours x 100%
  • Actual YTD % = Actual YTD Total / Baseline Total Man Hours x 100%
  • Target YTD % = Target YTD Total / Baseline Total Man Hours x 100%

The calculations for each S-curve are shown below.

100% Baseline

01‑Feb-2016

02‑Feb-2016

03‑Feb-2016

04‑Feb-2016

05‑Feb-2016

06‑Feb-2016

07‑Feb-2016

Baseline YTD

6.0

20.0

43.0

78.0

90.0

--

--

Baseline YTD %

6.67%

22.22%

47.78%

86.67%

100.00%

--

--


Actual YTD

--

9.0

18.0

38.0

--

--

--

Actual YTD %

--

10.00%

20.00%

42.22%

--

--

--


Target YTD

--

14.5

29.0

48.5

73.0

90.0

95.0

Target YTD %

--

16.11%

32.22%

53.89%

81.11%

100.00%

105.56%

Table 10: Calculation of Percentage S‑curves, Baseline = 100%

The resulting S-curves are shown in Figure 18.

Figure 18: Percentage S-curves (Baseline = 100%)
Figure 18: Percentage S-curves (Baseline = 100%)

Generating Percentage S-curves (Target = 100%)

To generate Percentage S‑curves with the Target = 100%, divide the Year To Date (YTD) daily totals for each S‑curve by the Target total Man Hours for each Day of the Project.

  • Baseline YTD % = Baseline YTD Total / Target Total Man Hours x 100%
  • Actual YTD % = Actual YTD Total / Target Total Man Hours x 100%
  • Target YTD % = Target YTD Total / Target Total Man Hours x 100%

The calculations for each S-curve are shown in Table 11.

100% Target

01‑Feb-2016

02‑Feb-2016

03‑Feb-2016

04‑Feb-2016

05‑Feb-2016

06‑Feb-2016

07‑Feb-2016

Baseline YTD

6.0

20.0

43.0

78.0

90.0

--

--

Baseline YTD %

6.32%

21.05%

45.26%

82.11%

94.74%

--

--


Actual YTD

--

9.0

18.0

38.0

--

--

--

Actual YTD %

--

9.47%

18.95%

40.00%

--

--

--


Target YTD

--

14.5

29.0

48.5

73.0

90.0

95.0

Target YTD %

--

15.26%

30.53%

51.05%

76.84%

94.74%

100.00%

Table 11: Calculation of Percentage S-curves, Target = 100%

The resulting S-curves are shown in Figure 19.

Figure 19: Percentage S-curves (Target = 100%)
Figure 19: Percentage S-curves (Target = 100%)
Worked Example  Worked Example

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