Earned Value Analysis: SPI, CPI, and Project Performance
This paper applies earned value management (EVM) formulas to a hypothetical $500,000, ten-month project that is 40% complete at the end of month six with $425,000 spent. It calculates key metrics—Planned Value, Earned Value, Actual Cost, Schedule Variance, Cost Variance, Cost Performance Index, Schedule Performance Index, and Estimate at Completion—and explains what each reveals about project health. The paper then interprets an SPI below 1.0 as evidence that the project is behind schedule and discusses how earned value calculations collectively enable project managers to evaluate both scheduling and budget performance in a systematic, data-driven way.
- Earned Value Calculations: Step-by-step EVM formulas applied to scenario
- Interpreting a Schedule Performance Index Below 1: SPI below 1 signals behind-schedule project
- How Earned Value Calculations Assess Schedule and Budget Performance: EVM metrics evaluate cost and schedule health
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What makes this paper effective
- Clearly labels and defines each EVM variable before using it, making the calculations easy to follow for readers unfamiliar with the formulas.
- Shows all arithmetic steps, allowing the reader to verify results independently and understand how each metric is derived from the others.
- Connects numerical outputs to real managerial meaning—explaining not just what the numbers are, but what they signal about project health.
Key academic technique demonstrated
The paper demonstrates applied quantitative analysis: it takes a defined scenario, applies a standard framework (earned value management), and interprets the outputs in plain language. This is a common technique in project management coursework, where students must show they can move from formula to interpretation without losing the practical significance of each result.
Structure breakdown
The paper is organized into three sections. The first works through all EVM formulas sequentially for the given scenario. The second addresses a conceptual question about SPI values less than 1. The third provides a broader discussion of how EVM calculations support project decision-making in both schedule and cost dimensions.
Earned Value Calculations
The following earned value management (EVM) calculations are based on a project with a total budget of $500,000 spread evenly across ten months, yielding a planned spend rate of $50,000 per month. At the end of month six, the project is 40% complete and has spent $425,000 to date. Earned value management provides a structured framework for measuring project performance against both schedule and cost baselines.
PV (Planned Value) — the scheduled value at month six:
6 months × $50,000 per month = $300,000
EV (Earned Value) — the value of work actually completed:
40% × $500,000 = $200,000
AC (Actual Cost) — the actual cost of work completed:
$425,000 (given)
SV (Schedule Variance) — the difference between earned and planned value:
EV − PV = $200,000 − $300,000 = −$100,000
CV (Cost Variance) — the difference between earned value and actual cost:
EV − AC = $200,000 − $425,000 = −$225,000
BAC (Budget at Completion) — the original total project budget:
$500,000 (given)
CPI (Cost Performance Index) — a measure of cost efficiency:
EV / AC = $200,000 / $425,000 = 0.47 (47%)
SPI (Schedule Performance Index) — a measure of schedule efficiency:
EV / PV = $200,000 / $300,000 = 0.67 (67%)
EAC (Estimate at Completion) — the projected total cost at completion, accounting for current cost performance:
AC + ((BAC − EV) / CPI) = $425,000 + (($500,000 − $200,000) / 0.47) = $1,063,297.83
Interpreting a Schedule Performance Index Below 1
A Schedule Performance Index (SPI) value less than 1 indicates that the project's schedule is behind its planned baseline. This is evident because the value actually earned is less than the value that was planned to be earned at that point in time. In this case, an SPI of 0.67 means the project has only accomplished 67 cents of scheduled work for every dollar of work that was planned.
Conversely, if the SPI value were greater than 1, it would indicate that the project has earned more value at that point in time than originally planned—meaning the project is ahead of schedule.
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