A BARS replaces vague labels such as good or excellent with descriptions of what an answer at each level actually contains. For a question on handling complaints, a low anchor might read 'blames the customer or escalates straight away', a middle anchor 'listens and follows the standard process', and a high anchor 'resolves the issue and prevents it recurring'. Assessors match each answer to the closest description.
Clear anchors reduce disagreement between assessors and make scores easier to explain to hiring managers and candidates. Building them takes effort, usually drawing on real examples of good and poor performance in the job, and they need revisiting when the role changes. Paired with structured questions, a BARS makes interviewing more consistent and leaves less room for gut feel and first impressions.