P90 (90th percentile)

FSO v1.0

Updated: 2025-08-13

Definition

Value at or below which 90% of observations fall. Used for SLA commitments.

Middle value in a sorted dataset. Preferred for skewed time metrics.

A formal target for a measurable outcome (e.g., "answer time P90 ≤ 60 s"). SLAs use distributions (P90) or medians, not means.

Part of the Fleet Super Operator Standard (FSOP) v1.0 •Editorial Policy