What is Behaviorally Anchored Rating Scales?

Alternative Forms: Behaviorally-anchored rating scale
Legal Definition
Behaviorally anchored rating scales (BARS) are scales used to rate performance. BARS are normally presented vertically with scale points ranging from five to nine. It is an appraisal method that aims to combine the benefits of narratives, critical incidents, and quantified ratings by anchoring a quantified scale with specific narrative examples of good, moderate, and poor performance.
-- Wikipedia
Legal Definition
An employee rating system that grades based on patterns or behaviors.