Understanding Progress 8: What the Numbers Actually Mean
Progress 8 is the most important metric for secondary schools — but also the most misunderstood. Here's how it works, what a good score looks like, and why raw results can be misleading.
Key takeaways
- Progress 8 measures how much value a school adds compared to the national average
- A score of 0 is average; +0.5 means pupils gained roughly half a grade extra per subject
- It matters more than raw results because it accounts for pupils' starting points
- Small schools have wide confidence intervals — their scores are less reliable
- Check 3+ years of Progress 8 trends to spot consistency vs one-year anomalies
If you're researching secondary schools, you'll encounter Progress 8 everywhere — in league tables, on school profiles, and in Ofsted reports. It's arguably the single most important metric for judging a secondary school. But it's also widely misunderstood.
What Progress 8 measures
Progress 8 compares a school's GCSE results against what was predicted based on pupils' KS2 (age 11) results. It answers one question: did this school add more value than the average school with similar pupils?
Progress 8 score guide
| Score range | What it means | |
|---|---|---|
| Above +0.5 | Significantly above average | Exceptional value added — the school is getting outstanding results from its intake |
| +0.2 to +0.5 | Above average | Solid progress — pupils do better than predicted |
| -0.2 to +0.2 | Average | In line with national expectations |
| -0.5 to -0.2 | Below average | Worth investigating why — look at trends |
| Below -0.5 | Well below average | Likely to trigger Ofsted concern |
Score range
- Above +0.5
- Significantly above average
- +0.2 to +0.5
- Above average
- -0.2 to +0.2
- Average
- -0.5 to -0.2
- Below average
- Below -0.5
- Well below average
What it means
- Above +0.5
- Exceptional value added — the school is getting outstanding results from its intake
- +0.2 to +0.5
- Solid progress — pupils do better than predicted
- -0.2 to +0.2
- In line with national expectations
- -0.5 to -0.2
- Worth investigating why — look at trends
- Below -0.5
- Likely to trigger Ofsted concern
Why it matters more than raw results
A grammar school with 70+ Attainment 8 might have Progress 8 near zero — their pupils were already high-achievers at age 11, so the school merely maintained that trajectory. Meanwhile, a comprehensive with Attainment 8 of 45 might have Progress 8 of +0.8, meaning it dramatically improved outcomes for its intake.
The key distinction
Grammar school vs comprehensive — a real example
| Grammar School | Comprehensive | |
|---|---|---|
| Attainment 8 | 72 | 45 |
| Progress 8 | +0.1 | +0.8 |
| Intake | Top 25% at KS2 | Mixed ability |
| Verdict | Maintained trajectory | Dramatically improved outcomes |
Grammar School
- Attainment 8
- 72
- Progress 8
- +0.1
- Intake
- Top 25% at KS2
- Verdict
- Maintained trajectory
Comprehensive
- Attainment 8
- 45
- Progress 8
- +0.8
- Intake
- Mixed ability
- Verdict
- Dramatically improved outcomes
The comprehensive adds far more value, despite lower headline results.
The confidence interval caveat
Every Progress 8 score comes with a confidence interval. A school scoring +0.1 with a confidence interval of -0.2 to +0.4 might not be meaningfully different from zero. Small schools (under 100 pupils in Year 11) tend to have wide confidence intervals, so their scores are less reliable.
Watch out for small cohorts
How to use Progress 8 on School Atlas
On every secondary school profile, the Performance tab shows Progress 8 with historical trends. On league tables, you can sort by Progress 8 to find schools adding the most value in your area.
Pro users can see 15 years of Progress 8 trends, which reveals whether a school is consistently strong or riding a one-year anomaly.
The bottom line
When comparing secondary schools, check Progress 8 first to understand quality, then Attainment 8 to understand outcomes. A school with positive Progress 8 is more likely to get the best out of your child — whatever their starting point.
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