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ArticleApril 27, 2026

If Feedback Isn't Compounding, Is Development?

Feedback is one of the strongest drivers of professional growth. But the evidence comes with a condition the coaching field tends to underplay.

Feedback is one of the strongest drivers of professional growth. That's not a new idea, and it's not a contested one. Across coaching, education, leadership development, and adjacent fields, the evidence is consistent.

But the evidence comes with a condition that the coaching field tends to underplay.

Hattie and Timperley's 2007 meta-analysis is one of the most cited pieces of feedback research in existence. Their key finding, that feedback produces some of the highest effect sizes of any educational intervention, is what usually gets quoted. What gets quoted less often is their finding that the effect depends heavily on frequency, specificity, and the degree to which feedback is connected to observable performance over time. Feedback that is generalized, isolated, or delayed doesn't produce those effects. It produces much weaker ones.

Most coaching feedback is isolated.

Here's the typical cycle. A session happens. Notes get written, if they get written at all. A supervisor or mentor coach may observe one session and comment on a moment. The coach reflects on what they noticed. Sometimes the feedback lands. Sometimes it changes something real. But the next session starts fresh, mostly disconnected from what came before.

A coach might hear about their use of silence in one session. Their question structure in another. Their tendency to direct in a third. But without a thread connecting those observations across time, there's no way to answer the questions that actually matter: Is this a pattern? Is it getting better? Is the coach developing range, or staying comfortable? Are the sessions six months ago meaningfully different from the sessions today?

These questions require accumulated evidence. They require feedback that compounds.

Ericsson's deliberate practice framework explains why this matters mechanically. The development of expertise isn't a function of effort alone. It requires a feedback loop: perform, receive specific feedback, adjust, repeat. Without that loop running consistently, practitioners can accumulate experience without accumulating skill in the ways that count. Time in the field doesn't automatically translate to improvement. The feedback conditions do.

Research on spaced learning adds another dimension. A study on spaced education for professional development found that distributing feedback and review across time, rather than concentrating it in isolated episodes, significantly improves retention and transfer. The same principle applies to coaching development. A coach who receives structured, repeated feedback on specific behaviors across multiple sessions is in a categorically different learning environment from one who receives occasional comments on one-off observations.

The frustration here is real on both sides. Coaches who are working hard, reflecting genuinely, and trying to grow often can't tell where their effort is actually producing change. And program leaders and faculty who care about development find themselves without a clear way to see what's improving, what's stalling, and where support is most needed.

A 2022 grounded theory study by Carden found that coaches who developed most significantly had access to structured, external feedback that accumulated over time. The internal reflection was there, but it wasn't sufficient on its own. The external signal was what made development visible and actionable.

The issue isn't that coaches don't want feedback. Most do. The issue is that the feedback systems around coaching development weren't designed to compound. They were designed around discrete episodes, not developmental arcs.

Which raises a question worth sitting with: if feedback isn't compounding, is development? Not in the sense that growth is impossible without a perfect system. Of course it's not. But growth that compounds requires feedback that compounds. And right now, most coaching programs aren't set up to provide it.

The opportunity isn't to add more feedback. It's to make feedback accumulate. To connect observations across sessions, surface patterns over time, and give coaches something they can actually track their development against.

That starts by treating feedback as a continuous signal, not an occasional event.

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