Earned value management integrates scope, schedule, and cost into a single performance measurement system. Done correctly, it tells you exactly where a project stands and where it will end up — long before the deadline arrives. Done poorly, it generates numbers nobody understands or uses.
- Earned value measures the value of work actually completed, not money spent
- SPI < 1.0 means behind schedule; CPI < 1.0 means over budget — both are early warning signals
- The estimate at completion (EAC) is the most useful EVM output for executive reporting
- EVM works best when the baseline is realistic — a bad baseline produces misleading metrics
The three foundational EVM values
Planned Value (PV): the budgeted cost of work scheduled to be done by this point. Earned Value (EV): the budgeted cost of work actually completed. Actual Cost (AC): what was actually spent. These three numbers drive all EVM analysis.
The key EVM metrics
Schedule Performance Index: EV ÷ PV. Values below 1.0 mean behind schedule. Cost Performance Index: EV ÷ AC. Values below 1.0 mean over budget. Variances (SV = EV − PV, CV = EV − AC) quantify the magnitude of performance gaps.
Estimate at completion
The most useful EVM output for executives: BAC ÷ CPI gives the expected total cost of the project at current performance. If the budget is $1M and CPI is 0.85, the forecast completion cost is $1.18M. This is the number sponsors care about.
Using EVM in practice
Report EVM metrics in the weekly status report alongside qualitative explanation. A CPI of 0.92 with an explanation of the variance driver — a vendor delay, a scope addition that was not change-controlled — is far more useful than the number alone.
Frequently asked questions
No. EVM adds value on projects with defined scope, realistic baselines, and budget over roughly $500K. Smaller projects with flexible scope are better managed with lighter reporting approaches.
The performance measurement baseline (PMB) is the approved, time-phased budget the project is measured against. An unrealistic baseline makes EVM misleading rather than informative.
Agile EVM uses story points or completed features as the earned value measure instead of planned cost. It requires a stable velocity baseline to be meaningful.
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