Earned Value Analysis (EVA) is a favorite yet controversial tool for project management that provides an objective measurement of project performance in terms of its scope (tasks), schedule (time) and budget (cost). Supporters claim EVA measures how much of the time and money budgeted for a project is "earned." Its detractors say EVA can misrepresent true project status in either schedule or expenditures.

## Earned Value Analysis

EVA uses the planned schedule and budget along with what has actually occurred to develop three values that indicate the relative health of a project. These values are: Planned Value (PV), which is the budgeted cost of tasks that should be complete; Earned Value (EV), which is the total budgeted costs of complete tasks; and Actual Cost (AC), which is the total expenditures to-date.

Example: The project budget is \$100,000. Sixty percent of the tasks should be complete, so PV is \$60.000. Only 50 percent of the tasks are actually complete, making EV \$50,000. AC is \$65,000.

## EVA Variances

EVA calculates two variances: cost variance (CV) = EV - AC, and schedule variance (SV) = EV - PV.

Using the values in Section 1, CV is minus \$15,000. It has cost \$65,000 to complete \$50,000 of planned work. SV is minus \$10,000. The project is behind schedule by \$10,000 worth of work.

## EVA Indexes

Two indexes indicate the performance of the project. Cost performance index (CPI) = EV/AC. Schedule performance index (SPI) = EV/PV. Using the data in Sections 1 and 2, CPI is 0.77 and SPI is 0.83.

If the indexes are equal to one, the project is on schedule/on budget; less than one, the project is behind schedule/over budget; and greater than one, the project is ahead of schedule/under budget.

## CPI Issues

Once a project is over/under budget, CPI remains essentially the same for the remainder of the project, unless EV or AC changes significantly. CPI is dependent on AC for accuracy. If AC does not include all appropriate costs and payments, CPI can be unreliable.