What it means
Traditional project tracking compares actual spend to budget, or asks a project manager what percentage of the work is complete, and both can mislead. Spending exactly on budget does not mean a project is on schedule, since a delayed project can simply be spending its budget more slowly than planned.
Self-reported percentage complete is also often optimistic, since it relies on judgement rather than an objective measure tied to the money involved. Earned value solves both problems by converting physical progress into a dollar figure that can be compared directly with both the budget and the actual spend.
Three figures form the core of the method. Planned value is the budgeted cost of the work that was supposed to be done by the current point in the schedule.
Earned value is the budgeted cost of the work actually completed by that point, regardless of what was actually spent to complete it. Actual cost is the real money spent to accomplish that work.
Comparing earned value with planned value answers whether the project is ahead of or behind schedule, in cost terms; comparing earned value with actual cost answers whether the project is spending more or less than budgeted for the work it has actually done. Together they separate two questions that a simple budget-versus-actual comparison conflates.
From the three base figures come two widely used pairs of measures. Schedule variance, earned value minus planned value, and the schedule performance index, earned value divided by planned value, measure schedule performance in cost terms.
Cost variance, earned value minus actual cost, and the cost performance index, earned value divided by actual cost, measure cost efficiency. An index above 1.0, or a positive variance, is favourable; below 1.0 is unfavourable, and the further from 1.0, the more significant the problem.
These measures become forward-looking through an estimate at completion, commonly calculated as the total budget divided by the current cost performance index, which assumes that past cost efficiency continues for the remainder of the project. A well-documented finding in project management practice is that the cost performance index tends to stabilise, and become a more reliable predictor of the final outcome, once a project is roughly 20% complete, which is why experienced practitioners are cautious about drawing firm conclusions from very early readings.
Earned value management requires a well-defined baseline, a time-phased budget tied to a detailed work breakdown structure, to work at all, so its usefulness depends entirely on the quality of the original plan. It works best where progress can be objectively measured against discrete, verifiable deliverables, and less well where the work is highly creative or the scope is fluid.
It is a data input to management judgement, explaining what has happened in cost and schedule terms, not a replacement for the judgement about why it happened or what to do next.
In practice
Real-world examples.
Example
A construction project with a schedule performance index of 1.05 and a cost performance index of 0.95 is running slightly ahead of schedule but consistently over budget, prompting the project manager to check whether crews are working overtime to hit schedule milestones.
Example
A software implementation with a cost performance index of 1.10 in its first two months looks efficient, but because the project is only 8% complete, the project office treats the figure as too early to be reliable and waits until 20% completion before reporting a trend.
Example
A government contractor required to report earned value monthly on a large defense contract uses a persistently declining cost performance index over six months to raise an early conversation with the client about scope or budget, rather than waiting for a year-end overrun to surface.
Think of it
“Earned value translates work completed into dollar terms-the budgeted value of what you've actually done.
Formula
Calculation
Planned Value (PV) = Budgeted cost of the work scheduled to be complete by the status date
Earned Value (EV) = Percentage of work actually completed x Total Budget at Completion (BAC)
Actual Cost (AC) = Money actually spent to date
Schedule Variance = EV minus PV; Schedule Performance Index = EV / PV
Cost Variance = EV minus AC; Cost Performance Index = EV / AC
Estimate at Completion (EAC) = BAC / CPI; Variance at Completion = BAC minus EAC; Estimate to Complete = EAC minus AC
Worked example. A project has a total Budget at Completion of $1,000,000, scheduled over 10 months at roughly $100,000 of budgeted work per month. At the end of month 6:
Planned Value = 6 x 100,000 = $600,000, the work that should have been done by now
The project team assesses that 50% of the total scope has actually been completed, so Earned Value = 50% x 1,000,000 = $500,000
Actual costs recorded to date = $560,000
Schedule Variance = 500,000 minus 600,000 = negative $100,000; Schedule Performance Index = 500,000 / 600,000 = 0.83, completing work at 83% of the planned rate
Cost Variance = 500,000 minus 560,000 = negative $60,000; Cost Performance Index = 500,000 / 560,000 = 0.89, receiving 89 cents of planned value for every dollar spent
Estimate at Completion = 1,000,000 / 0.8929 = $1,120,000, meaning the project is trending toward finishing about $120,000 over its original budget if current cost performance continues
Variance at Completion = 1,000,000 minus 1,120,000 = negative $120,000, confirming the projected overrun
Estimate to Complete = 1,120,000 minus 560,000 = $560,000 of budget still needed to finish the remaining half of the work, more than the $500,000 a naive "half the budget left" estimate would have assumedCase study
Seen in the real world.
A regional transit authority's $40,000,000 rail platform upgrade was tracked using earned value management from the outset, with a baseline budget phased monthly against a detailed work breakdown structure. At the end of month 8 of a planned 20-month schedule, the project's planned value stood at $18,000,000, in line with the schedule, while the contractor had completed work with a budgeted value, an earned value, of $15,000,000, at an actual cost of $17,500,000.
Schedule variance was negative $3,000,000, a schedule performance index of 15,000,000 divided by 18,000,000, or 0.83, and cost variance was negative $2,500,000, a cost performance index of 15,000,000 divided by 17,500,000, or 0.857. Applying the standard estimate at completion formula, EAC = 40,000,000 / 0.857, or approximately $46,700,000, implying a forecast overrun of about $6,700,000, more than four months before the authority's monthly progress meetings, which had relied on the contractor's self-reported 42% complete figure, would otherwise have raised any alarm.
The transit authority's project controller used the earned value figures to call a formal review with the contractor at month 8 rather than waiting for the problem to surface later. The review found that underground utility relocations, a work package worth about $4,000,000 of the budget, had been proceeding more slowly and at higher cost than planned because of unmapped legacy cabling, a risk the project's risk register had flagged but that had not yet triggered any contingency release. The authority released $3,500,000 of contingency, added a survey crew to the utility relocation work package, and required the contractor to report cost and schedule indices weekly for that package specifically.
By month 14, the project's overall cost performance index had recovered to 0.96 and its schedule performance index to 0.94, and the project finished at month 21, one month late and about $2,100,000 over the original budget, a result the project controller's closing report characterised as a materially better outcome than the $6,700,000 overrun the month 8 trend had implied, crediting the early warning earned value management had provided and the contingency response it triggered.
Watch out
Common mistakes.
- Relying on a contractor's or team's self-reported percentage complete instead of an objectively measured earned value, which tends to run optimistic and masks problems until late in the project.
- Drawing firm conclusions from cost or schedule performance indices very early in a project, before roughly 20% of the work is complete, when the indices are statistically unreliable and can swing sharply with a single milestone.
- Confusing being on budget, actual cost close to planned value, with being on schedule and on cost, when the only way to know both is to compare planned value, earned value and actual cost together.
Questions
People also ask.
What is the difference between Earned Value and Actual Cost?
Earned value is the budgeted cost of the work actually completed, a measure of physical progress valued at planned rates; actual cost is the real money spent to achieve that progress. Comparing the two shows whether the project is spending efficiently for the progress made.
Why is a cost performance index below 1.0 a warning sign?
It means the project is getting less than a dollar of planned value for every dollar actually spent, so it is running over budget relative to the work completed, and if that rate continues the project will finish above its original budget by roughly the same proportion.
Can earned value management be used on small or informal projects?
Yes, in a simplified form, though its full discipline, a detailed baseline budget, a formal work breakdown structure and regular objective measurement of progress, is most valuable on large, complex projects where a contract or regulator requires it; a small project can still benefit from tracking planned value, earned value and actual cost without the full apparatus.
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