KPI
CPI
Cost Performance Index
Plain English
Are we getting a dollar of work for every dollar we spend? 1.00 means on-budget, under 1.00 means over-budget (you're paying more than you're earning).
Worked Example
CPI 0.93 → You spent $1.00 but only earned $0.93 of work — a 7% cost overrun so far.
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