Moderation
Moderation is the process by which teachers compare samples of marked work to check that a mark scheme has been applied consistently, so the same work would receive the same mark whoever marked it.
What is moderation in schools?
Moderation is the quality-assurance process where teachers in a department compare samples of marked work to check they are applying the mark scheme consistently. It protects fairness for students and confidence in reported grades, and it is a routine part of assessment practice in British-curriculum secondary schools.
Moderation exists because marking involves judgement, and judgement varies. Two conscientious teachers can read the same answer against the same mark scheme and award different marks - not through carelessness, but because criteria need interpreting. Left unchecked, those differences mean a student's grade depends partly on who marked their work. Moderation is how a department finds and closes those gaps, so that grades are comparable across classes and defensible to students, parents and leaders.
How departments moderate
The usual pattern: after an assessment is marked, the head of department samples scripts from each class - often across the ability range - and re-reads them against the mark scheme. Where judgements differ, the markers discuss the discrepancy, agree the correct interpretation, and adjust marks where needed. It is careful, necessary work, and it is time-consuming: the more markers and classes involved, the more sampling it takes to be confident the standard holds.
Moderation and AI marking
Consistency is also the frame through which to judge AI marking. When the first pass of marking is drafted against the same guidelines for every class, differences in final judgement are easier to see and discuss, because they are no longer buried inside each marker's separate first pass. The principle of moderation - check the standard, don't assume it - applies to AI-drafted marking exactly as it does to human marking.
Key takeaways
- Moderation checks that a mark scheme has been applied consistently across different markers.
- It usually involves sampling marked work from each class and comparing judgements across a department.
- Moderation protects fairness for students and confidence in reported grades.
- Standardisation before marking makes moderation after marking quicker, because every marker starts from a shared standard.
Frequently asked questions
What is the difference between moderation and standardisation?
Standardisation happens before marking: teachers agree how the mark scheme should be applied, usually by marking exemplar answers together. Moderation happens after marking: samples are compared to check the agreed standard was actually applied. Departments typically use both - standardisation to set the standard, moderation to verify it.
Why does moderation take so long?
Because it is a manual comparison exercise: a head of department samples scripts from each class, re-reads them against the mark scheme, and reconciles differences in judgement with each marker. The more markers, classes and assessments involved, the more samples it takes to be confident the standard is consistent.
Related terms
Standardisation
Standardisation is the process of agreeing how a mark scheme should be applied before marking begins - typically by marking exemplar work together - so that every marker works to the same standard.
Inter-rater reliability
Inter-rater reliability is the extent to which different markers award the same mark to the same piece of work - a measure of how far a mark depends on who marked it.
Exemplar
An exemplar is a piece of work - often a real student answer - presented with its marks and commentary to show what a particular standard looks like in practice.
AI marking
AI marking is the use of artificial intelligence to assess student work against defined criteria - a mark scheme or a teacher's own marking guidelines - and to draft marks and feedback for a teacher to review.
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