Evidence for Feedback: the modern model #

Every substantive claim on the Feedback: the modern model page is checked against current research. Here is each claim, how well today’s evidence supports it, and the sources. The full, de-duplicated source list lives on the references page.

Supported · strong evidence — Feedback is among the most powerful influences on learning and achievement, but its effect is highly variable—some feedback helps substantially while some has little or even negative effect.

Hattie & Timperley’s synthesis and Wisniewski, Zierer & Hattie’s 2020 meta-analysis of 435 studies both report that feedback is on average one of the larger influences on achievement while emphasising that its impact varies widely with type and conditions; the variability finding is well established.

Sources: Hattie & Timperley (2007), The power of feedback, Review of Educational Research — https://doi.org/10.3102/003465430298487 · Wisniewski, Zierer & Hattie (2020), The power of feedback revisited: A meta-analysis of educational feedback research, Frontiers in Psychology — https://doi.org/10.3389/fpsyg.2019.03087 · full reference ›

Supported · moderate evidence — Effective feedback addresses three questions—where am I going (the goal), how am I doing (current progress), and where to next (the next step)—rather than only reporting current standing.

The three-question (feed-up / feed-back / feed-forward) model is the central framework of Hattie & Timperley’s review and has become a standard, widely-adopted organising scheme in the feedback literature; it is a conceptual synthesis well grounded in the reviewed evidence rather than a single experimental result.

Sources: Hattie & Timperley (2007), The power of feedback, Review of Educational Research — https://doi.org/10.3102/003465430298487 · full reference ›

Supported · moderate evidence — Feedback that targets the task and the processes used to do it (and that supports self-regulation) is more effective for learning than feedback that has no clear next step.

Hattie & Timperley distinguish feedback at the task, process, self-regulation and self levels and argue task- and process-level feedback (and feedback that builds self-regulation) is most productive; the 2020 meta-analysis similarly finds feedback providing information for improvement (high-information feedback) outperforms simple verification, consistent with this ordering.

Supported · strong evidence — Feedback directed at the self or person (such as general praise like ‘you’re clever’) is largely ineffective for learning, and can be counterproductive, because it diverts attention from the task.

Kluger & DeNisi’s meta-analysis found feedback interventions cueing attention to the self (rather than the task) were among the least effective, and Hattie & Timperley reach the same conclusion that self-level praise carries little learning value; the harm of person-focused versus task-focused feedback is one of the more robust findings in this area.

Sources: Kluger & DeNisi (1996), The effects of feedback interventions on performance: A historical review, a meta-analysis, and a preliminary feedback intervention theory, Psychological Bulletin — https://doi.org/10.1037/0033-2909.119.2.254 · Hattie & Timperley (2007), The power of feedback, Review of Educational Research — https://doi.org/10.3102/003465430298487 · full reference ›

Supported · strong evidence — A substantial minority of feedback interventions actually reduce performance rather than improve it, often when the feedback directs attention to the self rather than to the task.

Kluger & DeNisi’s meta-analysis of 607 effect sizes found that roughly one-third of feedback interventions decreased performance, a frequently-cited result that directly supports the claim; their feedback-intervention theory attributes much of the harm to self-focused attention.

Supported · moderate evidence — Marks or grades convey little information for improvement and can crowd out written comments; learners given comments alone improve more on the next task than those given a grade, or a grade plus the same comments.

Butler’s classic experiment found students given only comments improved subsequent performance and interest, whereas those given grades—or grades together with comments—did not, with the grade appearing to undermine engagement with the comments; the result is well known and has been broadly replicated in spirit, though it is a single study line and effect sizes vary by context.

Sources: Butler (1988), Enhancing and undermining intrinsic motivation: The effects of task-involving and ego-involving evaluation on interest and performance, British Journal of Educational Psychology — https://doi.org/10.1111/j.2044-8279.1988.tb00874.x · full reference ›

Supported · moderate evidence — Feedback is most useful when it arrives while the learner can still act on it—while the task and reasoning are still fresh—rather than long after the work is finished.

Shute’s review of formative-feedback research concludes that feedback should be timed so learners can use it, and that whether immediate or somewhat delayed is best depends on task difficulty and learner level; the general principle that actionable timing matters is well supported, even though the immediate-versus-delayed question is itself nuanced.

Sources: Shute (2008), Focus on formative feedback, Review of Educational Research — https://doi.org/10.3102/0034654307313795 · Hattie & Timperley (2007), The power of feedback, Review of Educational Research — https://doi.org/10.3102/003465430298487 · full reference ›

Mixed · moderate evidence — Whether immediate feedback is better than delayed feedback depends on the situation, so timing should be chosen rather than assumed; constant immediate feedback is not always optimal.

The immediate-versus-delayed feedback question is genuinely contested: Shute’s review finds immediate feedback often helps initial acquisition while delayed feedback can aid transfer and retention in some conditions, and outcomes depend on task difficulty and learner ability. The page’s claim that timing is situation-dependent, not fixed, reflects this mixed evidence honestly.

Sources: Shute (2008), Focus on formative feedback, Review of Educational Research — https://doi.org/10.3102/0034654307313795 · Kulik & Kulik (1988), Timing of feedback and verbal learning, Review of Educational Research — https://doi.org/10.3102/00346543058001079 · full reference ›

Supported · moderate evidence — Relying on continual external (augmented) feedback can impair longer-term independent performance; fading feedback so the learner takes over monitoring builds more durable, self-regulated skill.

The motor-learning ‘guidance hypothesis’ shows that frequent augmented feedback can boost practice performance yet degrade retention when the feedback is withdrawn, and Hattie & Timperley frame the goal of feedback as developing self-regulation; both converge on fading external feedback as the aim. The principle is well established though its magnitude varies by task.

Sources: Salmoni, Schmidt & Walter (1984), Knowledge of results and motor learning: A review and critical reappraisal, Psychological Bulletin — https://doi.org/10.1037/0033-2909.95.3.355 · Hattie & Timperley (2007), The power of feedback, Review of Educational Research — https://doi.org/10.3102/003465430298487 · full reference ›

Supported · moderate evidence — Feedback only improves learning if the learner uses it; received feedback that is not acted upon does not close the gap between current and desired performance.

Wisniewski, Zierer & Hattie emphasise that feedback must be received and acted on to affect learning, and that high-information feedback enabling a next step is what drives the larger effects; the principle that feedback works through subsequent learner action is well supported, though effects depend on how the feedback is used.

Sources: Wisniewski, Zierer & Hattie (2020), The power of feedback revisited: A meta-analysis of educational feedback research, Frontiers in Psychology — https://doi.org/10.3389/fpsyg.2019.03087 · Hattie & Timperley (2007), The power of feedback, Review of Educational Research — https://doi.org/10.3102/003465430298487 · full reference ›