The workplace consensus on feedback is unusually unanimous: more is better, sooner is better, candor is virtuous. Books, manager training programs, and HR best-practice decks all push in the same direction. The empirical literature is much messier. About a third of feedback events make performance worse, not better, and the effect is large enough that “always give feedback” is bad advice from a results standpoint.
This isn’t a license to skip hard conversations. It’s a case for being more careful about how, when, and what feedback gets delivered.
The Kluger and DeNisi finding everyone forgets
In 1996, Avraham Kluger and Angelo DeNisi published a meta-analysis of 607 feedback studies that has shaped almost every academic discussion of the topic since. Their headline result: while feedback improved performance on average, in 38% of cases it made performance worse. The effect was strongest when feedback focused on the person rather than the task, when it was delivered without context, or when the recipient lacked the skills to act on it.
This finding has been replicated repeatedly. Yet most workplace feedback culture still operates as if feedback is a unidirectional good. Managers are evaluated on whether they give regular feedback, not on whether the feedback they give produces improvement. The volume metric crowds out the quality metric. The result is well-meaning managers delivering performance-degrading critiques and getting praised for their candor.
What separates useful from harmful feedback
The studies that find positive effects share specific features. The feedback is task-specific rather than identity-focused — “this paragraph buries the lead” rather than “you struggle with structure.” It’s actionable, meaning the recipient can do something different next time. It’s delivered close in time to the work but not so close that emotions are still high. And it’s calibrated to the recipient’s skill level. Beginners need different feedback than experts; ignoring this is a common failure mode.
What harmful feedback shares is the opposite: vague, evaluative, identity-tied, and detached from a clear path forward. “I just want you to know your presentation didn’t land” is technically feedback. It’s also nearly useless, and worse, it activates threat responses that reduce subsequent performance. Recipients of this kind of feedback often work harder and produce worse results — a known and counterintuitive pattern.
When silence is the better move
There are situations where giving feedback at all is the wrong call: when you don’t have enough information to be specific, when the recipient can’t act on it, when the relationship doesn’t have the trust to absorb it, or when the issue is so minor that flagging it costs more attention than fixing it would. Most managers I’ve worked with would benefit from giving 30% less feedback overall, and making the remaining 70% sharper.
The goal isn’t kindness. It’s accuracy and impact. Vague feedback delivered constantly is worse than precise feedback delivered when it can change something.
Bottom line
Feedback is a tool, not a virtue. The right amount, well-timed and well-targeted, raises performance. The wrong amount, delivered casually, often lowers it. Treat it like a scalpel, not a hose.
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