Inspection reports are among the most useful independent evidence you have when choosing a school — but only if you understand who carried out the inspection and how to read what they wrote. Confusingly, different types of school are inspected by different bodies, and both major inspectorates have changed how they report in the last couple of years.
This guide explains the difference between ISI and Ofsted, what each one inspects, how the reports have changed, and how to read an inspection report so it actually informs your decision.
Two inspectorates, different schools
The first thing to grasp is that not all schools are inspected by the same organisation.
- Ofsted (the Office for Standards in Education, Children's Services and Skills) inspects state schools in England, along with many other settings. It also inspects some independent schools.
- ISI (the Independent Schools Inspectorate) inspects most independent schools that belong to the associations within the Independent Schools Council. If you're looking at a private school, there's a good chance its inspection was carried out by ISI rather than Ofsted.
So when you compare a state school and an independent school, you may be reading reports from two different inspectorates, using different frameworks and language. They are not directly equivalent, and shouldn't be read as if they are.
What changed recently
Both inspectorates have evolved, so older reports and older advice can be out of date.
Ofsted: the end of single-word grades
For years, Ofsted summed schools up in a single headline word — Outstanding, Good, Requires Improvement or Inadequate. That changed: the single overall grade was scrapped in 2024, following widespread concern that one word was too crude and too high-stakes to be fair or genuinely informative.
In its place, Ofsted introduced a new inspection model with report cards, which came into use in late 2025. Rather than a single label, these give a fuller picture across several areas of a school's work, with safeguarding generally reported as a separate met/not-met outcome. The aim is to show parents a school's specific strengths and weaknesses rather than reduce it to one word.
The practical upshot: if you read an older Ofsted report, you may see the old single-word grade; newer inspections present a more detailed, multi-area picture. Check the date and read accordingly.
ISI: its own framework
ISI uses its own inspection framework, distinct from Ofsted's, reporting on whether independent schools meet the required standards and evaluating the quality of education and pupils' personal development in its own terms rather than via Ofsted-style headline grades. Because ISI's approach differs, an ISI report reads differently from an Ofsted one — comparing the two requires reading the substance, not matching labels.
What inspections cover
Despite their differences, both inspectorates examine broadly similar territory:
- Quality of education — teaching, curriculum and how well pupils learn and achieve.
- Behaviour and attitudes — conduct, respect and the climate for learning.
- Personal development — wellbeing, character, and preparation for life beyond school.
- Leadership and management — how well the school is run and led.
- Safeguarding — whether children are kept safe, treated with particular seriousness by both bodies.
The exact categories, terminology and the way judgements are expressed differ between the inspectorates and have shifted with recent reforms, so focus on what the report says in each area rather than hunting for a single comparable score.
How to read an inspection report
A report rewards careful reading far more than a glance at any summary.
- Check the date. Schools change — leadership, staff and culture can shift quickly. A glowing report from several years ago may no longer reflect reality; a critical one may have been addressed. Recent reports carry more weight.
- Read the whole thing, not just the headline. The detail is where the value lies. Look at what inspectors say about teaching, behaviour, wellbeing and leadership, and at the specific examples they give.
- Look at the direction of travel. Compare against any previous report. Is the school improving, holding steady or slipping? Trajectory matters as much as the current position.
- Note safeguarding carefully. Both inspectorates treat child safety as fundamental. Any concern here deserves close attention and a direct conversation with the school.
- Identify strengths and weaknesses that matter to you. A weakness in an area irrelevant to your child matters less than a strength in something you prioritise. Read with your own family's needs in mind.
- Treat it as one input. An inspection is a snapshot by visitors over a short period. It's valuable evidence, but it doesn't replace visiting, talking to current families and forming your own view.
Comparing across inspectorates
When your shortlist mixes state and independent schools, you'll be comparing Ofsted and ISI reports side by side. To do this fairly:
- Don't force equivalence. Resist the urge to line up a word or grade from one against the other. Read the substance of what each says about teaching, care and outcomes.
- Compare like areas. Look at how each report describes, say, pastoral care or quality of education, and judge those descriptions on their merits.
- Account for the framework changes. A school inspected under an older Ofsted regime and one inspected under the new report-card model will read very differently even if both are strong.
- Layer in other evidence. Combine inspection findings with results (read in the context of intake), your visits and conversations with families.
You can pull together inspection ratings, results and other details for the schools you're weighing up using our comparison tool, and browse local options through our explore tool.
Common misunderstandings
- "It's Outstanding, so it must be best." Beyond the fact that single-word grades have been retired, an old top grade reflects a past snapshot and a particular intake. Read current detail, not legacy labels.
- "ISI and Ofsted grades mean the same thing." They don't — different bodies, frameworks and language. Compare substance, not labels.
- "A clean report means it's right for my child." Inspections judge a school against standards, not against your child's needs. Fit is something only you can assess.
- "The summary is enough." The detail and the trajectory tell you far more than any opening line.
The bottom line
Inspection reports are a valuable, independent check on a school — but they only help if you know who wrote them and how to read them. Independent schools are usually inspected by ISI, state schools by Ofsted, the two use different frameworks, and both have recently changed how they report, with Ofsted retiring its single-word grades in favour of more detailed report cards. Read the full, recent report, watch the direction of travel, weigh safeguarding seriously, and treat the whole thing as one important piece of evidence alongside your own visits and the school's results.
Next steps: Compare schools on inspection ratings and results, or explore the options in your area to start gathering the evidence.