Calibration Sessions: The Quiet Engine of Fair Performance Management

Industrial-organizational psychologists have measured manager rating tendencies for decades. The result is consistent: a 5-point performance scale, used by 20 untrained managers, produces a 1–1.5 point spread for identical performance. Calibration is the only known correction.

Why calibration exists

Without calibration, the rating an employee receives is partly a function of who their manager is. Lenient managers protect their teams; stringent managers punish theirs. The result is unfair compensation, unfair promotion, and lost trust in the entire performance system.

Structure of a 90-minute session

The facilitator's playbook

• Open with the definitions — people drift in 12 months.
• Never let a manager defend their own team unchallenged. Ask peers: 'Does this rating compare cleanly to someone in your team at the same level?'
• Name biases out loud when you see them. 'I think we're recency-biased here — what did this person do in Q1?'
• Time-box every case to 7 minutes. Endless debate hides indecision.
• Capture decisions in real time on a shared screen. No 'we'll write it up later'.

Post-calibration discipline

• Within 48h: HR analyses final distribution by protected class and reports back to the group.
• Managers brief their direct reports within 2 weeks using the calibrated rating.
• Compensation decisions flow from calibrated ratings, not pre-calibration proposals.
• Notes from the room never leave the room. Confidentiality is the only reason managers will speak honestly next time.