What does a CPI value greater than 1.

According to the PMBOK® Guide, the Cost Performance Index (CPI) is the most critical Earned Value Management (EVM) metric for measuring the cost efficiency of a project.

The Formula: $CPI = \frac{EV}{AC}$ (Earned Value divided by Actual Cost).

Interpreting a CPI > 1.0: A value greater than 1.0 indicates that for every dollar spent on the project, more than one dollar ' s worth of work was actually accomplished. This means the project is performing more efficiently than planned and is currently under budget (cost under the estimated value).

Benchmarking Performance:

CPI = 1.0: The project is exactly on budget (Cost = EV).

CPI < 1.0: The project is over budget (Cost > EV).

CPI > 1.0: The project is under budget (Cost < EV).

Analysis of Other Options:

A. Cost right at the estimated value: This would result in a CPI of exactly 1.0.

C. Cost right at the actual value: This is a tautology; actual cost is always the actual value spent, but CPI measures that against the value earned.

D. Cost over the estimated value: This would result in a CPI of less than 1.0 (e.g., 0.85), indicating cost inefficiency.