Guide
Peer assessment with rubrics: a practical classroom guide
Peer assessment works when students know exactly what to look for and the teacher does not spend hours collating responses. Here is how to organise it, how much weight to give it, and how to keep the scores fair.
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The essentials
- Peer assessment is students evaluating their classmates’ work against shared criteria.
- A rubric with clear descriptors is what makes it reliable: each student picks a level per criterion instead of guessing a mark.
- It usually counts for 10–30% of the grade, or is shown without counting while the class learns to assess.
What is peer assessment?
Peer assessment (or peer evaluation) is when a student evaluates a classmate’s work or contribution against shared criteria. Together with self-assessment and teacher assessment, it is one of the three main forms of formative assessment.
Its value goes beyond the grade: applying the rubric to someone else’s work helps students understand what is expected and improve their own.
How do you run peer assessment with a rubric, step by step?
Share the rubric before the task, decide who assesses whom, ask each student to pick a level per criterion and justify it with a comment, then combine those scores with the teacher’s.
- 1Introduce the rubric at the start of the task, not the end — ideally with an example.
- 2Decide the assignment: everyone assesses everyone, each student assesses their group, or each assesses two or three classmates.
- 3Ask for one level per criterion and a short comment. The comment makes students actually look at the work.
- 4Set a deadline and track who has responded.
- 5Average the peer scores per criterion and combine them with your own using the agreed weight.
- 6Give each student their result along with the comments they received.
How much should peer assessment count toward the final grade?
Typically 10–30% of the assignment grade. The first few times, it can be worth showing it without counting it (0%) so the class practises assessing with the rubric before it has consequences.
| Situation | Teacher | Peers | Self |
|---|---|---|---|
| First time assessing | 90% | 0% (shown) | 10% |
| Individual work | 70% | 20% | 10% |
| Group project | 60% | 30% | 10% |
| Oral presentation | 50% | 40% | 10% |
How do I stop students giving their friends high marks?
Use concrete descriptors, require a comment that justifies the score, have each piece of work assessed by several classmates, and check for odd patterns: pairs who score each other high, or reviewers who give everyone the same mark.
- Several reviewers per piece of work: the average dilutes one biased vote.
- Anonymous to the student receiving the assessment.
- Required comment with a minimum length.
- Reviewer checks: CoRubrics flags mutual bias, extreme leniency and inconsistency, and lets you exclude those scores.
What tool can automate peer assessment?
CoRubrics automates the whole process: it gives each student a link listing the classmates to assess, collects the responses, computes the weighted grade (teacher, peer and self), and sends every student their report. Students need no account.
There are other options, such as Moodle’s Workshop activity; our comparison of rubric and peer assessment software shows how they differ.
Frequently asked questions
What is the difference between peer, self- and teacher assessment?
In self-assessment students judge their own work; in peer assessment they judge classmates’ work; in teacher assessment the teacher does. The same rubric can combine all three.
Should peer assessment be anonymous?
Usually yes for the student receiving it, as it reduces social pressure. The teacher should still see who assessed whom in order to spot bias.
Does peer assessment work with younger students?
Yes, with rubrics that have few criteria and simple descriptors. A link with no password makes it much easier for young students to respond.
What if a student does not do their peer assessment?
You can apply a small participation penalty. CoRubrics lets you set one per form.
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