In this episode of The Science of Leading, Claire and Edwin unpack why so many performance reviews feel unfair, political, or just plain useless—and what leaders can do about it.Drawing on OAD’s performance evaluation framework, they break down the most common pitfalls in team and individual reviews: recency bias and halo/horns effects, personality-based judgments disguised as "fit," confusing effort with real outcomes, and rating scales that mean something different in every department.Claire surfaces the real questions managers are wrestling with—how do you keep reviews consistent, avoid bias, and still move fast?—while Edwin offers concrete, research-backed practices: anchoring reviews to shared team goals, insisting on specific evidence and work artifacts, using simple rating scales with behavioral anchors, and running calibration sessions that turn "manager opinion" into a defensible system.If you’re an HR leader, people manager, or founder who wants performance reviews to drive clarity, accountability, and development instead of anxiety and politics, this episode gives you a practical roadmap for doing reviews fairly—and making them actually useful.