In this guide
What accreditation actually means (and does not mean)
Accreditation is a process in which an external body audits a school against published standards. For credible bodies, the audit looks at governance, safeguarding, learning, teaching, pastoral care, facilities, finance and self-evaluation. Schools that pass receive a multi-year accreditation, typically renewed every five to seven years through a full inspection and an interim review.
What accreditation tells you is that the school is operating within reasonable bounds: child protection processes exist, finances are not visibly precarious, teaching meets a defined standard, and the school knows what it is trying to do. What it does not tell you is whether the school is excellent, whether your child will be happy there, or whether the academic outcomes will be what you hope. A school can be CIS-accredited and still mediocre; many are.
Treat accreditation as the floor, not the ceiling. It rules out the worst schools but does not identify the best. For broader context on evaluating schools see our guide on how to choose an international school.
General school accreditation bodies
For international schools, four general accreditation bodies dominate.
CIS (Council of International Schools)
Founded 1965. Around 730 member schools globally, of which around 470 are CIS-accredited. The most internationally respected general accreditation for international schools. Eight-year cycle with full team visits, focused on student learning, governance, safeguarding and intercultural learning. A CIS-accredited school is a school that has survived a serious external audit, and the audit reports are taken seriously by universities.
NEASC (New England Association of Schools and Colleges)
Founded 1885. The historic US regional accreditor; the international arm operates the ACE Learning Protocol and runs joint accreditations with CIS for many international schools. NEASC accreditation is a strong signal for US university recognition.
WASC (Western Association of Schools and Colleges)
Founded 1962, headquartered in California. Particularly common in Asia and the Pacific, partly because California-licensed teachers historically populated international schools in the region. WASC accreditation is universally accepted by US universities; some US-curriculum schools in Asia hold WASC alone, others combine WASC with CIS.
Middle States Association
Founded 1887. The historic mid-Atlantic US regional accreditor; the Commissions on Elementary and Secondary Schools handles international member schools. Common in Latin America and the Caribbean. Universally accepted by US universities.
Many premium international schools hold dual or triple accreditation. A school accredited by CIS, NEASC and IB simultaneously is signalling that it has cleared three different international audits within the same accreditation cycle. This is meaningful but not magical: it costs the school six-figure sums in consultant time and inspection fees each cycle, and not every excellent school chooses to fund it.
Free accreditation lookup guide
Our 6-page handbook on how to verify accreditation claims, including the direct lookup tools at CIS, NEASC, WASC, IBO and Middle States, is free with email. Useful when you want to confirm what a school is claiming on its website without taking the school's word for it. Request the handbook.
Curriculum-specific authorisation
Accreditation is school-wide. Authorisation is curriculum-specific. The two are distinct and both matter.
IB authorisation (International Baccalaureate)
The IB Organisation authorises individual programmes (PYP, MYP, DP, CP) at individual schools. Authorisation takes 2 to 3 years for a new school. A school cannot offer the IB Diploma without DP authorisation; an authorised school is on the IBO public list. Verify directly at ibo.org. See our IB curriculum guide.
Cambridge International authorisation
Cambridge Assessment International Education registers schools offering its qualifications. Schools must meet specific requirements for delivery and assessment. The status is verifiable on the Cambridge International school search tool.
BSO (British Schools Overseas) inspection
The BSO scheme accredits British curriculum schools outside the UK to a standard broadly equivalent to UK independent school inspection. Inspections are conducted by Penta International, COBIS or a small number of other DfE-approved bodies. Schools rated Good or Outstanding under BSO are credible British curriculum providers. The published inspection reports are well worth reading before enrolling.
COBIS membership
COBIS membership requires a Patron's Accreditation, equivalent to a UK Ofsted-style inspection conducted by COBIS or Penta International. Stronger British international schools globally are usually COBIS members. Useful for British curriculum families to verify.
Local regulators that matter
Some local regulators in major international school markets are now stronger than the international accreditors. The two most important examples are the Dubai KHDA inspection regime, which publishes annual ratings (Outstanding, Very Good, Good, Acceptable, Weak), and the Abu Dhabi ADEK inspection regime. Both publish detailed reports, hold schools to consistent standards, and are taken seriously by parents. A school with a KHDA Outstanding rating across multiple years is, in our view, a stronger signal than CIS accreditation alone. See our Dubai schools guide.
Other local regulators worth knowing about include the Singapore Ministry of Education registration regime, the Hong Kong Education Bureau, the Switzerland canton regulators, and the UK Independent Schools Inspectorate (ISI). Most credible international school markets now have a local regulator publishing inspection reports.
The accreditation cycle and what to ask
Accreditations expire. CIS runs on an eight-year cycle with a mid-term review. NEASC and WASC operate on five to ten years depending on protocol. IB authorisations are reviewed every five years. When you ask a school about its accreditation, ask three specific questions. First, when was the most recent inspection completed and when is the next due. Second, can you read the full report. Third, what recommendations did the inspectors make and how has the school responded.
Schools that hand over the full report willingly are confident. Schools that share only the headline ratings are usually hiding the body of the report. The CIS and NEASC report templates always include recommendations; the willingness to discuss those recommendations openly is a useful signal of school culture. The strongest schools we have visited routinely volunteer the report before being asked, and walk parents through the recommendations and the response.
If a school is mid-cycle, ask what the school changed after the last inspection. Look for substantive answers about teaching, assessment or governance rather than minor administrative tweaks. A school that has implemented genuine reforms in response to inspection feedback is using the process well. A school that treats accreditation as a once-every-eight-year ritual is using it badly.
Accreditation red flags
Several patterns warrant scepticism. A school claiming accreditation by an unfamiliar body should be checked. Some commercial accreditation operations exist primarily to collect fees from member schools and provide light-touch reviews. If you have not heard of the body, search for it on the relevant US Department of Education recognised list (for US-based accreditors), and on the Council on Higher Education Accreditation database. Bodies that do not appear on either are usually not meaningful.
A school describing itself as "in candidacy" or "applying for" accreditation should be asked when application was submitted and what the timeline is. Candidacy is normal for the first 2 to 3 years of a new school. Candidacy after year 5 suggests problems.
A school operating for more than 10 years with no international accreditation, and no credible local regulator inspection, is unusual. Many decent schools choose not to fund CIS or NEASC for legitimate cost reasons, but they typically have something. Schools with no third-party validation at all warrant deeper scrutiny: review parent feedback, ask to see the financial accounts, and verify the curriculum authorisations independently.
Finally, a school whose website conflates accreditation with awards is signalling something. "Awarded Best International School in Lower Saxony 2022" is marketing, not accreditation. Awards from industry magazines or paid league tables are not regulatory standards.
Frequently asked questions
What does accredited mean for an international school?
Accreditation means an external body has reviewed the school against published standards and confirmed compliance. It is not a guarantee of academic excellence, but it is a meaningful baseline for governance, safeguarding and educational quality.
Which accreditation matters most?
For international schools, CIS is the most globally respected general accreditation. NEASC, WASC and Middle States are US-based bodies operating internationally. For specific curricula, IB authorisation and BSO inspection are the relevant marks.
Should I avoid a school without accreditation?
Newly opened schools often operate for 3 to 5 years before securing full accreditation. That is normal. A school operating for 10+ years without any accreditation is a different signal and warrants scrutiny.
Does accreditation guarantee university recognition?
It strengthens it. Universities are familiar with CIS, NEASC, WASC and IB authorisation. Local accreditation in less recognised systems can require additional documentation when applying to international universities.
How can I verify a school's accreditation claim?
Use the public registers at cois.org for CIS, neasc.org for NEASC, acswasc.org for WASC, ibo.org for IB programmes and gov.uk for BSO reports. All are searchable by school name.