MIDYIS (Middle Years Information System) is a standardised baseline assessment taken by Year 7 or Year 8 pupils in many English secondary schools. It measures developed reasoning abilities rather than curriculum knowledge, and schools use the resulting score to predict likely GCSE grades and set target grades for individual pupils.
Who produces the MIDYIS assessment?
MIDYIS was developed by the Centre for Evaluation and Monitoring (CEM), originally based at Durham University and now part of Cambridge University Press and Assessment. CEM also produces two related assessments used at different school stages:
| Assessment | Year group | Purpose |
|---|---|---|
| MIDYIS | Years 7–8 | Baseline at start of secondary; predicts GCSE outcomes |
| YELLIS | Years 10–11 | Baseline at start of GCSE courses; refines GCSE predictions |
| ALIS | Sixth form | Baseline at start of A-Level; predicts A-Level outcomes |
These are separate from CAT4 (developed by GL Assessment), which measures similar reasoning abilities but uses a different methodology and scoring system. Some schools use one, some the other, and some use both at different points.
What does MIDYIS actually measure?
MIDYIS is a computer-adaptive or paper-based assessment that typically takes around 45–60 minutes. It assesses four main areas:
- Vocabulary: understanding of word meanings, particularly academic and subject-specific vocabulary
- Mathematics: numerical reasoning, not just GCSE content knowledge
- Perceptual speed and accuracy: the ability to process visual information quickly and accurately
- Non-verbal reasoning: identifying patterns and spatial relationships without relying on language
The assessment does not test what pupils have been taught in primary school — it is designed to measure developed cognitive ability and learning potential rather than prior curriculum knowledge. This is why it is described as a baseline rather than an attainment test.
How do schools use MIDYIS scores?
MIDYIS scores serve several purposes within a school:
- Predicted GCSE grades: CEM uses national data from thousands of pupils to calculate what GCSE grades pupils with a given MIDYIS score typically achieve. These become the starting point for setting target grades
- Setting and grouping decisions: in schools that group by ability, MIDYIS data informs which set a pupil is placed in at the start of Year 7 or at the point of setting
- Identifying underperformance: if a pupil with a high MIDYIS score is achieving below the predicted level by Year 9, the school can intervene earlier than it otherwise might
- School self-evaluation: Ofsted and school leaders use value-added measures that compare actual GCSE outcomes against MIDYIS-predicted outcomes, to judge how much the school has contributed to each pupil's progress
What score is "good" on MIDYIS?
MIDYIS scores are standardised on a scale of roughly 60–140, with the average set at 100. A score above 100 indicates performance above the national average for pupils of the same age; below 100 indicates below average. The distribution is designed so that:
- Around two-thirds of pupils score between 85 and 115
- A score of 115 or above places a pupil roughly in the top 15% nationally
- A score below 85 places a pupil in the lower 15%
What matters most is not the number in isolation but what the school does with it — whether target grades are set at an appropriately challenging level and whether the curriculum is adapted to support pupils at different points on the scale.
Should parents be concerned if their child's MIDYIS score is lower than expected?
A lower MIDYIS score is not a verdict on a child's intelligence or potential. MIDYIS measures developed abilities at one point in time, and these can change. Several factors can depress a score artificially:
- Anxiety about being assessed in a new school environment
- A recent change in circumstances (bereavement, house move, family stress)
- Undiagnosed SEND needs (particularly dyslexia or processing difficulties)
- English as an additional language affecting the vocabulary section disproportionately
If you believe your child's score does not reflect their genuine ability, speak to the SENCO or their form tutor. Schools that use MIDYIS well triangulate it with other evidence — primary school reports, teacher assessment, and classroom observation — rather than treating it as the final word.
Can pupils prepare for MIDYIS?
CEM explicitly states that MIDYIS is not a test you can revise for in the way you would prepare for a curriculum exam. Because it measures reasoning ability and vocabulary rather than specific learned content, cramming is not effective. Encouraging your child to read widely, engage with puzzles and logic problems, and arrive on assessment day well-rested and calm is genuinely more useful than any targeted preparation.
Frequently asked questions
Will my child be told their MIDYIS score?
Practice varies. Some schools share scores with pupils and parents as part of the new intake process; others use the data internally without sharing individual results. If you want to know your child's score, ask the school directly — most will share it on request, alongside an explanation of what it means.
Does MIDYIS determine which GCSE options my child can take?
MIDYIS data is one of several factors schools consider when making recommendations about GCSE option choices, but it should not be the only factor, and it is not a gate that can be locked. Teachers' classroom assessments over KS3, subject-specific tests, and the child's own interests and motivation all matter. If you feel a school is using MIDYIS to restrict your child's options unfairly, request a meeting with the head of year.
How is MIDYIS different from SATs?
Primary school SATs (sat at the end of Year 6) measure curriculum attainment in English and mathematics against the national curriculum. MIDYIS measures reasoning ability and learning potential, not prior curriculum knowledge. SATs results are reported to secondary schools as part of the primary-secondary transition; MIDYIS is administered afresh by the secondary school, often in the first half-term of Year 7.
What is YELLIS and when is it taken?
YELLIS (Year 10 and 11 Information System) is the companion assessment administered at the start of Year 10, at the beginning of GCSE courses. It refines the predictions that MIDYIS provided at Year 7, taking into account the progress pupils have made during KS3. YELLIS scores produce updated GCSE grade predictions that schools often use when setting Year 10 and Year 11 target grades and intervening with pupils who are below trajectory.
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