Time-Based SPI (Earned Schedule)
| Field | Value |
|---|---|
| ID | time_based_spi |
| Metric | Lipke SPI(t) = ES / AT from duration-weighted S-curve |
| Threshold | ≥ 1.00 (Solutions Platform interpretation) |
| Authority | derived |
Intent
Schedule performance without cost data. Not a PAM §4 numbered metric. Distinct from Overview Temporal Compass SPI (actual/planned %, ADR 0168).
Implementation
computeTimeBasedSpi in src/kernel/progress/timeBasedSpiLogic.ts using shared S-curve builders in src/kernel/progress/sCurveSeriesLogic.ts.