Most managers assume that telling someone about a problem will fix it. The research is less encouraging. A review published in the Journal of Evaluation in Clinical Practice and archived on PubMed Central (read on 2026-10-17) summarizes a large meta-analysis by Kluger and DeNisi covering 131 studies. Feedback had a positive effect on average, but more than one third of the feedback interventions were associated with worse performance.
The same review explains why. Under the theory those researchers developed, people change when they notice a gap between what they did and a goal they care about. Feedback that shifts attention toward the person's self-image instead of the task tends to backfire. The review also reports (read on 2026-10-17) that in one analysis of 85 interventions, only a small fraction combined feedback with performance goals and an action plan, even though control theory suggests all three are needed.
In everyday terms, feedback fails for three reasons:
- It is vague. "Be more proactive" gives the person nothing to do differently.
- It is late. Feedback saved for a quarterly review arrives after the details are forgotten.
- It feels like an attack. The person spends the conversation defending themselves instead of listening.
Deep End Strategies names the same three failures as timing, specificity and delivery, and notes that each is fixable with a little structure.



