Schedule Performance Index (SPI) Glossary Definition

Term Schedule Performance Index (SPI)
Definition

Schedule Performance Index (SPI) is an earned-value ratio that compares earned value with planned value.

Context & Usage

SPI helps teams evaluate schedule performance in value terms rather than only by calendar dates.

Project managers, sponsors, and project-controls staff use this concept in budget reviews, performance reporting, forecasting, and variance conversations.

Related concepts include Budget, Cost Baseline, Planned Value, Earned Value, Actual Cost and Cost Variance.

Categories Knowledge Management and Content Governance