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Earned Value Management – S Curve

TechConsults

Earned Value Management - S Curve

Project Management- SK 22

 

S-Curve and project Management

S Curve is used for planning, monitoring, controlling, analyzing, and forecasting project’s status, progress, & performance over time and can be used to find the historical trends in project development

A project when planned, needs money for its execution, along with the requirement for other parameters (Man, Material, Money, Methods, Motivation, Management Etcetera). The project activities / tasks are sequenced as per requirements on time line of the project. The Work Breakdown Structure (WBS) breaks the activities / tasks into small components for different units to work on them, and as such the cost aspects of the works are ascertained (determined in scientific manner / observations).

 

With the help of WBS and the schedule it is ascertained how much money is required periodically. Mostly in all the project the pace of work starts slowly in the starting phase of the project. After that the speed of execution of project increases and this stage continues for most of the project work to get completed. In the closing stage of the project the pace of work slows down, and the project gets completed after some time.

The requirement of fund is therefore analogous to the pace of work.Let us consider the project period of 12 months. The money required as described above is tabulated as monthly requirement or fund flow requirement or the planned requirement of project work.

The table below shows the monthly and cumulative fund flow requirement.

Months

Monthly Expenses

Cumulative Expenses

January

70

0

February

200

270

March

400

600

April

800

1400

May

1600

3000

June

2000

5000

July

3000

8000

August

4500

12500

September

2000

14500

October

1000

15500

November

500

16000

December

300

16300

January

0

16300

 

The graph between the cumulative fund flow and project time line is given below. The curve generated as such is a Sigmoidal Curve (Mathematically) and has a shape resembling the letter ‘S’. Hence is called S-Curve. Its use is also in business and other operations along with life sciences. The curve shown below is a S–Curve

S-curve is an important management tool in project management. This represents project fund flow and may be revised during project period based on approved changes. S- curve is based on planned expenses. Actual expenses (AC) are plotted along with earned values (EV) on time scale. The graphical analysis of the plotted curve data gives three important data at particular time as follows:

PV= the planned value (S-Curve)

Ac= the actual money spent

EV= the value of work done.

The curves of AC, PV, EV may further be analyzed to get the following data:

Schedule Variance (SV)

Cost Variance (CV)

Budget at Completion (BAC)

Schedule Performance Index (SPI)

Cost Performance Index (CPI)

Estimate To Complete (ETC)

Estimate At Completion (EAC)

To Complete performance Index (TCPI)