Measurement Performance Domain

The Measurement Performance Domain addresses assessing project performance and taking action to maintain acceptable performance. Effective measurement is purposeful — measures are chosen because they support decision-making, not for their own sake.

Good measures are SMART (Specific, Measurable, Achievable, Relevant, Time-bound) and balanced across leading and lagging indicators. PMBOK 8 emphasises both delivery metrics (schedule, cost, scope, quality) and value metrics (outcomes, benefits, stakeholder satisfaction).

Earned Value Management (EVM) integrates scope, schedule, and cost into a single objective performance measurement system. Key formulas: EV (Earned Value) = % complete × BAC; SV (Schedule Variance) = EV − PV; CV (Cost Variance) = EV − AC; SPI (Schedule Performance Index) = EV / PV; CPI (Cost Performance Index) = EV / AC; EAC (Estimate at Completion) = BAC / CPI (or AC + bottom-up ETC). A CPI < 1 means over budget; an SPI < 1 means behind schedule.

Adaptive projects use different metrics: velocity, lead time, cycle time, throughput, escaped defects, and cumulative flow. The right metrics depend on the approach and the questions being asked.

Beware of measurement pitfalls: vanity metrics (look good but don't drive decisions), Goodhart's Law (when a measure becomes a target, it ceases to be a good measure), and analysis paralysis.

Key Points

• Measure to support decisions, not for the sake of measurement
• Balance leading (predictive) and lagging (results) indicators
• Measure delivery (schedule, cost, scope, quality) AND value (outcomes, benefits)
• EVM integrates scope/schedule/cost: PV, EV, AC are the building blocks
• CPI = EV/AC; SPI = EV/PV; values < 1 indicate problems
• EAC = BAC/CPI (typical) — projects what the total will cost at current performance
• Adaptive metrics: velocity, lead/cycle time, throughput, escaped defects
• Beware Goodhart's Law — measures that become targets get gamed
• Vanity metrics look good but don't change behaviour — avoid them
• Forecasting (EAC, ETC, VAC) is more useful than past variance alone

Key Terms & Definitions

Earned Value (EV)

The measure of work performed expressed in terms of the budget authorised for that work. EV = % complete × BAC.

Planned Value (PV)

The authorised budget assigned to scheduled work to be accomplished by a given point in time.

Actual Cost (AC)

The actual cost incurred for the work performed to date.

CPI

Cost Performance Index = EV / AC. A measure of cost efficiency. <1 = over budget; =1 = on budget; >1 = under budget.

SPI

Schedule Performance Index = EV / PV. A measure of schedule efficiency. <1 = behind; =1 = on schedule; >1 = ahead.

EAC

Estimate at Completion — the expected total cost of the project at completion. Common formula: EAC = BAC / CPI.

ETC

Estimate to Complete — the expected cost to finish the remaining work. ETC = EAC − AC.

Velocity

An agile metric of the amount of work a team completes in a given timebox (e.g. story points per sprint).

Lead Time

The total elapsed time from when work is requested to when it is delivered.

Cycle Time

The elapsed time from when work begins on an item to when it is delivered.