Peer Marking
A structured assessment strategy where learners evaluate each other's work against clear success criteria, developing their ability to identify quality and give constructive feedback.

What is peer marking?
- Share clear success criteria before learners begin the task
- After completing the task, learners swap work with a partner
- Each learner marks their partner's work against the criteria
- Provide time for the author to read feedback and respond to it

How it works
Peer marking gives learners practice in evaluating work against criteria. This is a high-value thinking activity because it requires learners to understand what quality looks like before they can assess someone else's work. The evaluative skills they develop transfer directly to improving their own work.
Success criteria must be clear and shared before the task begins. If learners do not know what they are looking for, peer marking becomes subjective and unhelpful. Display the criteria prominently and discuss what each criterion means with examples of what it looks like when met and when not met.
When learners mark a partner's work, they should identify strengths first, then suggest one specific improvement. This structure prevents feedback from becoming negative or vague. "You have used three different sentence starters, which meets criterion two. To improve, you could add a connective at the start of your third paragraph to link your ideas together." This kind of feedback is more useful than "good" or "needs more detail."
The response phase is essential. After receiving peer feedback, learners must have time to read it, decide whether they agree, and make changes if appropriate. This creates a complete feedback cycle: produce, evaluate, improve.
Classroom example
A Year 8 Languages, Literacy and Communication class in a Ceredigion school has written persuasive letters. The success criteria are displayed: "Use at least three persuasive techniques," "Address the reader directly," "Include a call to action," and "Organise into clear paragraphs." Learners swap letters and mark against the criteria using a green pen. One learner writes: "You used rhetorical questions and emotive language (two techniques) but I could not find a third. Your call to action in the last paragraph is strong." The author reads this, identifies that she used repetition but did not label it, and underlines the example.
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Peer marking develops the "Reflect" strand of thinking skills by building learners' capacity to evaluate quality and give constructive feedback. It supports the Four Purposes by developing "ambitious, capable learners" who understand assessment criteria and "ethical, informed citizens" who can offer respectful, honest feedback.
Rainbow Curriculum's Thinking Tools lens helps you plan where peer assessment is embedded across your curriculum, building a consistent culture of feedback and improvement.
Tips
- Model peer marking with the whole class using an anonymous example before learners try it themselves.
- Use a different coloured pen for peer marking so both the author and teacher can see the feedback clearly.
- A common pitfall: peer marking without clear criteria. Vague criteria lead to vague feedback.
- Start with simple, concrete criteria and build towards more complex qualitative judgements over time.
- Combine with two stars and a wish for a simple feedback structure.
Source: Adapted from "How to develop thinking and assessment for learning in the classroom", Welsh Assembly Government, Guidance 044/2010.




