How can bias affect performance ratings and how can it be mitigated?

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Bias can color performance ratings by causing evaluators to rely on subjective impressions rather than observable results, leading to inflated, deflated, or inconsistent scores. For example, a rater who personally enjoys working with someone might rate them higher even if the work quality isn't consistently strong, while recency or similarity biases can distort recent or familiar behaviors into overall judgments.

Mitigation involves structured, evidence-based practices: use standardized criteria with clearly defined rating levels so everyone评 aligns on what each score means; provide rater training to surface and manage common biases; run calibration sessions where raters discuss and align their judgments to ensure consistency across the organization; incorporate objective metrics or data where possible to anchor ratings in measurable outcomes; and collect input from multiple raters to balance individual perspectives. These steps help ensure ratings reflect actual performance rather than personal biases and improve fairness and reliability.

Saying bias has no effect, that mitigation isn’t needed, or that only legal departments handle bias doesn’t fit the reality of performance management; bias is a natural risk in human judgments that these practices are designed to reduce.