Feedback that helps students learn: what the research says, and how to give it
Information a student gets about their work or performance, from a teacher, a peer, themselves or a program, that they can use to close the gap between where they are and where they're going.
What the research says
- Strong
- Promising
- Mixed
- Thin
- Contradicted
Mixed, because feedback is powerful in both directions. A 2020 meta-analysis of 435 studies found feedback improved learning on average (d = 0.48), but results varied so much that it can't be treated as one thing, and what the feedback said mattered most. A classic meta-analysis found feedback helped on average while more than a third of feedback interventions made performance worse, especially feedback aimed at the person rather than the task. Feedback that tells students what to do next on the task works; feedback about the student can backfire.
Rated Mixed. Two syntheses support it. One rigorous study found it works only in some forms or for some students. One review or weaker study adds context but doesn't move the rating. How we rate the evidence
Checked against each source in October 2026.
The studies behind this rating
Feedback had a medium effect on learning on average, but results varied so much that feedback can't be treated as one consistent treatment. What the feedback said mattered most, and feedback affected thinking and motor skills more than motivation and behavior.
Sample 435 studies, 994 effect sizes, over 61,000 participantsEffect d = 0.48Read it at the source (opens in a new tab)Feedback helped on average (d = .41), but more than a third of feedback interventions made performance worse, and feedback worked less well the more it turned attention toward the person rather than the task.
Sample 607 effect sizes, 23,663 observationsEffect d = .41 on average; over a third of feedback interventions decreased performanceRead it at the source (opens in a new tab)Feedback is among the major influences on learning, but its effect can be positive or negative, and the type of feedback and how it's given make a large difference. The authors propose a model of what makes feedback effective and discuss timing and positive versus negative feedback.
In US K–12 formative assessment studies, formal evidence such as written feedback on quizzes was linked with larger effects (d = 0.40).
Sample 33 US K–12 studies with a control group, 126 effect sizesWho School-age childrenEffect d = 0.29 overallRead it at the source (opens in a new tab)
What it is
Feedback is any information about performance that a learner can use. It can be a comment on an essay, a mark on a quiz item, a nod during a discussion, a peer's suggestion, a student checking their own answers against a key, or a computer saying "try again". Grades are a kind of feedback too, though not a very informative one.
John Hattie and Helen Timperley's review describes feedback as among the major influences on learning, and stresses that it can work for or against learning depending on its type and how it's given. Feedback that only reports a result ("7 out of 10", "good job") leaves out the most useful part: what to do next.
It helps to ask what a piece of feedback is about:
- The task: is this answer right or wrong, what's missing? ("The second paragraph has no evidence.")
- The process: how the student did it, and how to do it better. ("Check your units before you add.")
- Self-regulation: how the student monitors their own work. ("How could you check whether this answer is reasonable?")
- The self: praise or criticism of the person. ("You're so smart.") Kluger and DeNisi's analysis (below) suggests this is the least useful kind.
Why it works
Learning means closing a gap between what a student can do and what they're aiming for. Feedback tells them where the gap is and how to close it. Without it, students practice errors or stop at work that's nearly right.
Benedikt Wisniewski, Klaus Zierer and John Hattie's 2020 meta-analysis pooled 435 studies with over 61,000 participants. Feedback had a medium positive effect on learning on average. But the spread was huge: the authors conclude feedback can't be understood as a single consistent treatment. The information content mattered most, and feedback had more effect on thinking and motor skills than on motivation and behavior.
Avraham Kluger and Angelo DeNisi's 1996 meta-analysis of feedback in many settings, not only schools, found the same positive average, with a warning: more than a third of feedback interventions made performance worse. Their analysis suggested feedback loses power the more it draws attention away from the task and toward the person, toward self-image, praise or blame.
In US schools, Hansol Lee and colleagues' review of formative assessment found that formal evidence of learning, such as written feedback on quizzes, was linked with larger effects. Feedback is the working part of formative assessment.
How to start, by grade
Grades K–2
- Give feedback in the moment, out loud, about the task: "You wrote the first sound. Say the word again and listen for the last sound."
- Name what was done well specifically, not just "good job": "You counted each one once. That's why you got 7."
- Use a simple self-check: children compare their work to a model or a checklist with pictures.
- Give one thing to fix, then watch them fix it.
Grades 3–5
- Share success criteria before the task, so feedback can point to them.
- Give comments with one strength and one next step, tied to the criteria, and time in class to act on them.
- Hold back the grade on drafts, so students read the comment rather than the number.
- Teach peer feedback with a structure: two things that meet the criteria, one specific suggestion.
- Use quick whole-class feedback: after reading a set of exit tickets, show the class the two most common errors and how to fix them.
Grades 6–8
- Mark a sample of work in detail and give the rest codes (for example, E for missing evidence) that point to a class-wide reteach.
- Ask students to respond to feedback in writing: what they changed and why.
- Use answer keys for self-marked practice, so routine feedback is immediate and your comments are saved for harder work.
- Avoid praise and criticism of the person; comment on the work and the process.
- Check whether feedback worked: look at the revised work, not only the first draft.
Grades 9–12
- Use rubrics with clear criteria so feedback is specific and students can self-assess.
- Prioritize: two or three comments that would most improve the work, not every error.
- Build revision into major tasks so feedback has somewhere to go.
Examples
Two stars and a stepGrades 2–8
On each draft, the teacher writes two specific strengths tied to the success criteria and one next step ("Add a reason from the text to your second paragraph"). Students get ten minutes in the next lesson to make that change, and they highlight what they changed.
Whole-class feedback sheetGrades 4–12
Instead of writing the same comment on twenty essays, the teacher reads them all, notes the three most common issues, and writes one sheet with examples of each and how to fix it. Students find which issues apply to their essay and fix them in class. Faster for the teacher, and every student gets more feedback.
Hint ladder in mathGrades 3–8
When a student is stuck, the teacher gives the least help that works: first "What do you know?", then "What did we do in the example?", then pointing to the step that's wrong, and only then showing the step. Each rung keeps the thinking with the student.
Self-check with an answer keyGrades 3–12
Students do practice problems, then check against a key with worked solutions. They mark errors, find the step that went wrong using the key, and redo those problems. Immediate feedback on routine work, and the teacher's time goes to students who are still stuck.
Common mistakes
- Praise or criticism of the person.
- Kluger and DeNisi found feedback lost power as it moved toward the self. Comment on the work and how it was done, not on how clever or careless the student is.
- Feedback with no next step.
- "Good work" and "needs more detail" don't say what to do. Every comment should point to a specific change.
- Feedback after it's too late.
- Comments on finished, graded work are rarely acted on. Give feedback on drafts and practice, while work can still change.
- Grade and comment together.
- Students tend to look at the grade and skip the comment. Give comments first, grade later, or return comments without the grade.
- Too much feedback.
- Marking every error buries the important ones. Pick the two or three changes that would help most.
Time and cost
Time: the biggest cost of written feedback is teacher time. Whole-class feedback, codes, self-marking with keys and peer feedback cut it a lot.
Money: nothing.
Training: moderate. Writing short, specific, task-focused comments is a skill, and so is teaching students to give each other useful feedback.
Debates and open questions
Why is the rating Mixed when feedback is so popular? Because the research shows effects in both directions. The average is positive, but a large share of feedback interventions made things worse in Kluger and DeNisi's analysis, and Wisniewski and colleagues found results too varied to treat feedback as one treatment. The rating is about feedback in general; specific, task-focused feedback is on firmer ground.
Who wrote the reviews? Two of the four sources here have John Hattie as an author. The 2020 meta-analysis set out to replicate and extend his earlier Visible Learning work on feedback, and it stressed how much the effects vary. Kluger and DeNisi's independent analysis reaches a similar caution from a different direction.
Immediate or delayed? Hattie and Timperley discuss the timing of feedback as one of the thorny issues, without a single answer for every task. We haven't yet added a study that tests timing directly to this card, so we don't give a rule here.
Tools that do it
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- Rubric maker: clear criteria make feedback specific, and let students check their own work first.
- Exit tickets: read a class set and give whole-class feedback the next day on the most common errors.
- 25 formative assessment examples: quick checks that produce feedback you can act on.
- Math worksheet generator: practice sets with answer keys for immediate self-marking.
- Discussion sentence starters poster: sentence starters for kind, specific peer feedback.
Questions teachers ask
- What makes feedback effective?
- In the research summarized here: it's about the task and how to improve, not about the person; it gives a next step; it comes while the work can still change; and students have time to use it. What the feedback says matters more than how much there is.
- Is praise a kind of feedback?
- Yes, but praise of the person ("you're so smart") is the kind the research is most doubtful about. Kluger and DeNisi found feedback less effective the more it focused on the self. Specific praise of the work or strategy is more useful.
- How can I give feedback to 150 students?
- Use whole-class feedback on common errors, answer keys for routine practice, comment codes, and structured peer feedback, and save detailed written comments for a few key pieces each term.
- Is a grade feedback?
- It tells students how they did, but not what to do next. On its own, a grade is weak feedback; with a comment that names a next step, and time to act, it becomes useful.
Related in the Library
Cite this card
Written for teachers by Peabody Teach from the sources listed above, which we read on the publisher's or clearinghouse's own page. We summarize and link; we don't copy. No ads, no affiliate links. Something wrong or out of date? Tell us.