Earned Value Technique (EVT): 6 Methods Explained

<div class="ge-article-wrapper"><nav class="ge-toc" aria-label="Table of contents"><p class="ge-toc-label">In this article</p><ul class="ge-toc-list"><li><a href="#the-six-earned-value-techniques">The Six Earned Value Techniques</a></li><li><a href="#the-six-methods-explained">The Six Methods Explained</a></li><li><a href="#worked-example-mixing-evts-on-a-20m-project">Worked Example: Mixing EVTs on a £20M Project</a></li><li><a href="#why-the-choice-of-evt-changes-your-reported-numbers">Why the Choice of EVT Changes Your Reported Numbers</a></li><li><a href="#common-mistakes">Common Mistakes</a></li><li><a href="#frequently-asked-questions">Frequently Asked Questions</a></li></ul></nav><article class="ge-article-body"><p>An earned value technique is the specific method you choose to measure progress on a work package. Not the formula. Not the metric. The technique, the actual mechanism that converts physical reality into a number your <a href="/en/earned-value">earned value management</a> system can use. Get this choice wrong and every CPI, SPI, and EAC downstream is built on fiction.</p><p>There are six standard earned value techniques: weighted milestones, percent complete, units complete, level of effort (LOE), apportioned effort, and fixed formula. Most construction projects use one, usually <a href="/en/earned-value/definitions/percent-complete">percent complete</a>, for everything. That's lazy, and it produces unreliable data.</p><p>This term is part of the <a href="/en/earned-value/definitions">earned value definitions glossary</a>. For the full formula set, see the <a href="/en/earned-value/formulas">earned value formulas page</a>.</p><h2 id="the-six-earned-value-techniques">The Six Earned Value Techniques</h2><pre class="ge-ascii-diagram ge-anim"> CHOOSING AN EARNED VALUE TECHNIQUE – DECISION TREE What kind of work is it? │ ┌───────────────┼───────────────┐ ▼ ▼ ▼ DISCRETE WORK SUPPORT WORK DEPENDENT WORK (produces an (ongoing, no (tied to another output) end product) package) │ │ │ ▼ ▼ ▼ Can you count ────────► APPORTIONED physical units? LEVEL OF EFFORT │ EFFORT (LOE) (mirrors base ┌─────┴─────┐ package %) ▼ ▼ YES NO │ │ ▼ │ UNITS Are there COMPLETE clear milestones? │ ┌─────┴─────┐ ▼ ▼ YES NO │ │ ▼ ▼ WEIGHTED Is it short MILESTONES duration (&lt;3 periods)? │ ┌─────┴─────┐ ▼ ▼ YES NO │ │ ▼ ▼ FIXED PERCENT FORMULA COMPLETE (0/100 or (subjective – 50/50) last resort) </pre><p>Each technique has different strengths. The art is matching the right technique to the right work package.</p><h2 id="the-six-methods-explained">The Six Methods Explained</h2><h3>1. Weighted Milestones</h3><p>Assign a budget value to each milestone. EV is earned when the milestone is achieved. Nothing in between.</p><p>Best for work with clear, verifiable completion points: design deliverables, commissioning stages, statutory approvals. On a £2M design package with 8 milestones, each milestone might be worth £200K to £350K depending on effort weighting. You either delivered the Stage 3 design or you didn't. Binary. Objective.</p><p>The downside? Between milestones, reported progress doesn't move. That's fine for monthly reporting on packages with 6 to 10 milestones. It's a disaster for packages with only 2 milestones spanning 8 months.</p><h3>2. Percent Complete</h3><p>A qualified person estimates the percentage of work completed. EV = <a href="/en/earned-value/definitions/budget-at-completion">BAC</a> x estimated percent complete.</p><p>This is the most flexible technique and the most abused. See the <a href="/en/earned-value/definitions/percent-complete">percent complete definition page</a> for the full breakdown. When backed by <a href="/en/earned-value/definitions/physical-percent-complete">physical measurement</a> (units installed, metres laid), it's excellent. When it's a project manager saying "I reckon about 60%," it's worthless.</p><h3>3. Units Complete</h3><p>Count completed units and divide by total planned units. EV = (units completed / total units) x BAC.</p><p>The most objective technique for repetitive work. 340 of 500 piles installed = 68% complete. No judgement required. If your work package involves countable units, piles, panels, cable trays, door sets, drainage runs, use this. Always.</p><h3>4. Level of Effort (LOE)</h3><p>EV equals <a href="/en/earned-value/definitions/planned-value">planned value</a> by definition. Progress is measured by the passage of time, not output. See the full <a href="/en/earned-value/definitions/level-of-effort">Level of Effort page</a> for why this is dangerous if overused.</p><p>Reserve LOE for genuinely time-based work: site security, welfare facilities, general site supervision. Cap it at 15 to 20% of total BAC.</p><h3>5. Apportioned Effort</h3><p>EV is driven by another work package's progress. The <a href="/en/earned-value/definitions/apportioned-effort">apportioned effort</a> package has no independent measurement. It inherits the percent complete of its parent.</p><p>Use for QA inspection, health and safety support for specific packages, or testing that's directly proportional to installation progress.</p><h3>6. Fixed Formula (0/100 or 50/50)</h3><p>A fixed percentage is earned at start, the remainder at completion. The two common variants:</p><ul><li><strong>0/100:</strong> No EV until 100% complete. Used for very short duration activities (under 2 reporting periods).</li><li><strong>50/50:</strong> 50% EV at start, 50% at completion. A compromise for activities spanning 2 to 3 periods where detailed measurement isn't practical.</li></ul><p>I rarely see 50/50 on UK construction projects, but it's common in defence and aerospace EVM. It works well for procurement activities, 50% when the order is placed, 50% when the goods arrive on site.</p><h2 id="worked-example-mixing-evts-on-a-20m-project">Worked Example: Mixing EVTs on a £20M Project</h2><span class="ge-worked-label">Worked Example</span><div class="ge-callout ge-anim"><p><strong>Scenario:</strong> £20M mixed-use development in Birmingham. 18-month programme under NEC4 Option C. The project controls team assigns different EVTs across the WBS.</p><div class="ge-table-wrap ge-anim"><table class="ge-table"><thead><tr><th>Work Package</th><th>Budget</th><th>EVT Chosen</th><th>Rationale</th></tr></thead><tbody><tr><td>Piling (420 nr CFA piles)</td><td>£2,800,000</td><td>Units Complete</td><td>Countable, repetitive. 420 piles = objective measurement</td></tr><tr><td>Concrete Frame</td><td>£4,200,000</td><td>Weighted Milestones</td><td>14 pours, each a natural milestone. Pour complete = EV earned</td></tr><tr><td>M&amp;E First Fix</td><td>£3,100,000</td><td>Percent Complete (physical)</td><td>Too varied for units. Measure by zone completion against drawings</td></tr><tr><td>Curtain Wall</td><td>£2,400,000</td><td>Units Complete</td><td>180 panels. Each panel installed and sealed = 1 unit</td></tr><tr><td>Design &amp; Coordination</td><td>£1,600,000</td><td>Weighted Milestones</td><td>8 design deliverables with clear submission/approval gates</td></tr><tr><td>Fit-out Phase 2</td><td>£1,900,000</td><td><a href="/en/earned-value/definitions/planning-package">Planning Package</a></td><td>Not yet detailed. Converted to work packages in month 10</td></tr><tr><td>Site Prelims</td><td>£2,600,000</td><td>LOE</td><td>Time-based: supervision, welfare, security, temp services</td></tr><tr><td>QA &amp; Testing</td><td>£680,000</td><td>Apportioned Effort</td><td>Tied to concrete frame and M&amp;E progress</td></tr><tr><td>Commissioning</td><td>£720,000</td><td>Fixed Formula (0/100)</td><td>Short duration activities. Each system either commissioned or not</td></tr></tbody></table></div><p><strong>The EVT mix:</strong></p><ul><li>Discrete (units + milestones + percent complete + fixed formula): £14,800,000 (74% of BAC)</li><li>LOE: £2,600,000 (13% of BAC)</li><li>Apportioned: £680,000 (3.4% of BAC)</li><li>Planning package (not yet assigned): £1,900,000 (9.5% of BAC)</li></ul><p><strong>At month 8 reporting:</strong></p><ul><li>Piling: 380 of 420 piles = 90.5% complete. EV = £2,534,000</li><li>Concrete frame: 9 of 14 pours complete. Milestone EV = £2,730,000 (65% of budget based on weighted milestone values)</li><li>M&amp;E first fix: Physical survey shows 42% complete across zones. EV = £1,302,000</li><li>Curtain wall: 95 of 180 panels installed. EV = £1,266,667</li><li>Site prelims: Month 8 of 18 = 44.4%. EV = £1,155,556 (automatic. No measurement needed)</li></ul><p>The piling CPI is 1.04. The M&amp;E first fix CPI is 0.87. Because the team used units complete for piling, they're confident in that 1.04. Because they used physical percent complete (zone-by-zone surveys) for M&amp;E, they trust the 0.87 too. If they'd used subjective percent complete for both, neither number would be reliable.</p></div><h2 id="why-the-choice-of-evt-changes-your-reported-numbers">Why the Choice of EVT Changes Your Reported Numbers</h2><p>This is the part most people don't grasp. Two teams measuring the same work with different EVTs will report different earned values. Neither is "wrong" in a mathematical sense. But one will be closer to reality.</p><p>On that Birmingham project, the M&amp;E package manager initially wanted to use weighted milestones (first fix complete per floor). The project controls lead pushed back: the floors weren't being completed sequentially, and work was progressing across multiple zones simultaneously. Milestones would show zero progress for weeks, then a sudden jump. Percent complete by zone gave a smoother, more accurate picture of actual progress.</p><h2 id="common-mistakes">Common Mistakes</h2><ol><li><strong>Using one EVT for everything</strong>: Percent complete is the default because it's easy. But "easy to measure" and "accurate" aren't the same thing. If you can count units, count units. If you have milestones, use milestones. Only fall back to percent complete when nothing else fits.</li></ol><ol><li><strong>Too much LOE</strong>: Every percentage point of BAC allocated to LOE is a percentage point that can't signal a schedule problem. I've seen projects with 35% LOE. At that level, your <a href="/en/earned-value/definitions/schedule-performance-index">SPI</a> is mathematically incapable of dropping below 0.88 even if discrete work stops entirely.</li></ol><ol><li><strong>Choosing the EVT after work starts</strong>: The EVT must be assigned during the planning phase, before the <a href="/en/earned-value/definitions/performance-measurement-baseline">performance measurement baseline</a> is set. Changing EVTs mid-project invalidates trend analysis and makes period-over-period comparison meaningless.</li></ol><ol><li><strong>Not documenting the EVT in the WBS dictionary</strong>: Every <a href="/en/earned-value/definitions/control-account">control account</a> should have its EVT documented. When the person who set it up leaves the project (and they will), the replacement needs to know exactly how progress is measured.</li></ol><div class="ge-product-note ge-anim"><p><strong>How Gather helps.</strong> Gather's AI reads your site diaries daily and maps progress against your cost-loaded programme, giving you accurate earned value data without manual spreadsheet updates. <a href="https://gatherinsights.com/contact">Book a demo</a> to see it working on a live NEC4 project.</p></div><h2 id="frequently-asked-questions">Frequently Asked Questions</h2><h3>Which earned value technique is most accurate for construction?</h3><p>Units complete, by a significant margin. It's objective, auditable, and leaves no room for interpretation. The challenge is that not all work packages have countable units. For packages that do, piling, steelwork erection, panel installation, cable pulling, units complete should always be the first choice.</p><h3>Can you change the EVT mid-project?</h3><p>You can, but you shouldn't unless there's a compelling reason (like discovering the original choice is producing meaningless data). If you do change, document the reason, restate the baseline for that package, and note the discontinuity in your <a href="/en/earned-value/definitions/variance-analysis-report">variance analysis</a>. Never compare pre-change and post-change CPI as if they're the same measurement.</p><h3>What's the difference between EVT and EVM?</h3><p><a href="/en/earned-value/definitions/earned-value-management">Earned value management</a> (EVM) is the overall system. Earned value technique (EVT) is one component within that system, the specific method used to measure progress on each work package. EVM includes planning, budgeting, measuring (where EVTs live), analysing, and reporting. EVT is just the measurement part.</p><h3>How do I choose an EVT for a work package I don't fully understand yet?</h3><p>You don't. That's what <a href="/en/earned-value/definitions/planning-package">planning packages</a> are for. Assign the budget to a planning package and convert it to a proper work package with an assigned EVT once the scope is sufficiently defined. Guessing an EVT is worse than waiting.</p></article></div>