AMI-accredited private Montessori school on the Mesa/Tempe border serving children from 12 weeks through 6th grade.
Infant · Toddler · Primary · Elementary
MACTE, AMI, AMS: What Montessori Credentials Mean
“Montessori” is not a trademark. Anyone can paint the word on a sign, and nobody is obliged to follow the method behind it. That single fact is why these acronyms exist, and why they are worth ten minutes of your time before you tour a school. Start with MACTE — it is the one that sits over all the rest.
MACTE
The accreditation above all the others
The Montessori Accreditation Council for Teacher Education is the one most families have never heard of, and arguably the one that matters most. AMI, AMS, and the IMC each train teachers their own way — MACTE is the independent body that checks those training programs are any good, and it is recognized by the U.S. Department of Education to do it.
It accredits the course, not the person
This trips people up constantly. MACTE accredits the teacher education program — not the college that houses it, not the school that hires the graduate, and not the teacher individually. So a guide doesn't “have MACTE”; they hold a credential from a MACTE-accredited program. That phrasing is the thing to listen for.
Why a teacher wants one
A credential from a MACTE-accredited program travels. Many states will recognize it toward teacher licensure, it carries internationally, and employers can read it as a known quantity instead of taking a training route on trust. Where a program is Title IV eligible, students can also put federal grants and loans toward the tuition.
How a program earns it
The program writes a self-study arguing, with evidence, that its graduates are competent Montessori educators. MACTE then sends verifiers on site to check that the evidence is real. Credentials are issued by level, from Infant & Toddler through Secondary II, plus Administrator — which is why the age band matters.
What it means for you
It is the one check that works across traditions. If a school names a training route you have never heard of, you don't need to judge the route itself — you can simply ask whether it is MACTE-accredited, and look it up.
Whose programs MACTE accredits
AMI and AMS aren't rivals to MACTE — they are among the organizations that sit under it, alongside:
American Montessori Society (AMS)Association Montessori Internationale (AMI)International Montessori Council (IMC)Christian Montessori FellowshipInternational Association for Progressive MontessoriMontessori Educational Programs InternationalMontessori AustraliaIndependent training institutions
Look up a training program in MACTE's directory →The names you'll see on a school's website
These are the three that turn up on Arizona school websites. Each has its own training tradition and its own school reviews — and all three are MACTE Recognized Organizations, so their courses answer to the accreditor above.
AMI
Association Montessori Internationale
Founded 1929, AmsterdamMaria Montessori set AMI up herself, and it exists to keep her method intact. AMI training is the most prescriptive of the routes — long, full-time, and closely tied to the original materials and sequence. Schools can go further and apply for AMI recognition, which reviews the whole environment rather than one teacher.
→ An AMI credential is a strong signal of an orthodox, materials-faithful program.
AMS
American Montessori Society
Founded 1960, New YorkNancy McCormick Rambusch founded AMS to adapt Montessori to American schools, and it is now the largest Montessori organization in the United States. AMS is more willing to sit alongside state standards and conventional assessment, which is part of why so many US charter and public Montessori programs sit in its orbit.
→ An AMS credential signals authentic training with more room to flex to the American system.
IMC
International Montessori Council
Part of the Montessori FoundationThe IMC accredits schools rather than training individual teachers, and takes a deliberately broad view of what a legitimate Montessori school can look like. You will see it on schools that run Montessori alongside another framework — an IB diploma, say.
→ An IMC-accredited school has been reviewed as a whole school, not just staffed with trained guides.
Member ≠ accredited
This is the distinction worth carrying into a tour. Joining AMS or the IMC as a member is close to a subscription — a school pays, and may then use the logo. Being accredited by one of them is a multi-year review of the whole school: classrooms, leadership, staff credentials, records. Both appear on websites in similar-looking badges.
Neither is a scandal. But “we are an AMS member school” and “we are AMS accredited” are very different claims, so it is fair to ask which one a school means.
The other badges you'll see
Montessori schools often carry a second seal that has nothing to do with Montessori. These are general early-childhood and school accreditations, and they answer a different question: is this a well-run program? rather than is this really Montessori?
NECPA
Early childhood centers · since 1991
National Early Childhood Program Accreditation
Accredits the center against early-childhood quality standards, checked by an on-site verifier. NECPA also issues the Certified Childcare Professional (CCP) credential to individual educators.
NAEYC
Early learning programs · 30+ years
National Association for the Education of Young Children
The most widely recognized early-childhood accreditation in the country, with a public directory of accredited programs. Rigorous, and completely method-neutral — a NAEYC seal says a program is well run, not that it is Montessori.
Cognia
PreK–12 and postsecondary · 130+ years
Cognia, formerly AdvancED
The general school accreditor you will see on K–12 schools of every kind, in more than 100 countries. Useful signal for a school running through the upper grades, where the early-childhood accreditors stop being relevant.
Quality First
Arizona early care and education
Quality First (Arizona only)
Not an accreditation at all. It is Arizona's own quality improvement and rating program, funded by First Things First and free to regulated centers, homes, and preschools. A star rating reflects assessed classroom quality, not Montessori practice.
Neither column substitutes for the other. A center can hold NECPA and still run a thin Montessori program; a school can be rigorously Montessori and hold no general accreditation at all. A school carrying one from each column has been looked at from two directions — which is the strongest position a family can find.
What to ask on a tour
- Which training route do your guides hold — AMI, AMS, or another MACTE-accredited course? Which program issued it?
- Is that credential for the age group they teach? Training is level-specific: a primary (3–6) credential does not cover elementary.
- Is the school itself accredited, or a member? By whom, and when was it last reviewed?
- How long is the uninterrupted morning work period? Under two hours, the rest of the method struggles to function.
Arizona schools with a credential on record
We record a credential only where a school states one publicly. Plenty of good schools have credentials we haven't captured, so treat an empty field as “we don't know” rather than “no.” Tell us what we're missing.
AMI Accredited
AMI Affiliated
Private AMI-oriented Montessori school founded in 1982, serving East Valley families with programs from toddlers through 8th grade.
Toddler · Primary · Elementary · Middle
AMI Recognized
Keystone Montessori
Phoenix
AMI-affiliated Montessori school in Ahwatukee serving children from toddlers through adolescence, with a tuition-free charter program for elementary and middle school.
Public CharterAMI Recognized
Toddler · Primary · Elementary · Middle
AMS Member
Mis Manos Montessori School
Oro Valley
AMS-member Montessori school serving Oro Valley and northwest Tucson since 2011, offering Spanish-enriched programs for children 18 months to 9 years.
Toddler · Primary · Elementary
Cognia Accredited
Desert Garden Montessori
Phoenix
Private school in the Ahwatukee area of Phoenix serving infants through 12th grade, with Montessori programs through 6th grade and a Montessori/IB program for grades 7-12.
Infant · Toddler · Primary · Elementary · Middle · High
IMC Accredited
Desert Garden Montessori
Phoenix
Private school in the Ahwatukee area of Phoenix serving infants through 12th grade, with Montessori programs through 6th grade and a Montessori/IB program for grades 7-12.
Infant · Toddler · Primary · Elementary · Middle · High
NECPA Accredited
Private Montessori school in Chandler's Layton Lakes area serving infants through kindergarten.
Infant · Toddler · Primary
Ahwatukee campus of Inspire Kids Montessori, serving infants through kindergarten.
Infant · Toddler · Primary
Arizona schools stating their guides' training
A different claim from the one above: these schools tell you where their teachers trained, which is about the adults in the classroom rather than a review of the school.
Arrowhead Montessori
Peoria
Private Montessori school in Peoria with AMI-certified teachers, offering programs from toddlers through 8th grade.
Toddler · Primary · Elementary · Middle
Private Montessori school in Chandler's Layton Lakes area serving infants through kindergarten.
Infant · Toddler · Primary
Ahwatukee campus of Inspire Kids Montessori, serving infants through kindergarten.
Infant · Toddler · Primary
Private AMI-oriented Montessori school founded in 1982, serving East Valley families with programs from toddlers through 8th grade.
Toddler · Primary · Elementary · Middle
AMI-accredited private Montessori school on the Mesa/Tempe border serving children from 12 weeks through 6th grade.
Infant · Toddler · Primary · Elementary
Frequently asked questions
What is the difference between AMI and AMS?
AMI was founded by Maria Montessori in 1929 and holds closely to her original method and materials. AMS was founded in the United States in 1960 and adapts Montessori to the American school system, including state standards and testing. Both run rigorous, MACTE-accredited teacher training — they are two respectable traditions rather than a better and a worse one.
Is an AMS member school the same as an AMS accredited school?
No, and this is the distinction most worth understanding. Membership is essentially a subscription any school can pay for. Accreditation is a multi-year, evidence-based review of the whole school. A school describing itself as a 'member' has not necessarily been assessed by anyone.
Does a school need accreditation to be a real Montessori school?
No. Accreditation is expensive and slow, and plenty of excellent small schools never pursue it — particularly preschools. What matters more is whether the guides hold genuine training credentials and whether the classroom actually runs on Montessori principles. Accreditation is useful evidence, not a requirement.
What is MACTE, and why does it matter?
MACTE is the Montessori Accreditation Council for Teacher Education. It accredits Montessori teacher training programs — including AMI, AMS, and IMC ones — and has been recognized by the U.S. Department of Education since 1995 as a reliable authority on the quality of that training. A credential from a MACTE-accredited program is recognized by many states toward teacher licensure and internationally, so it is the most portable credential a Montessori guide can hold.
Can a teacher be MACTE-certified?
Not quite, and the wording matters. MACTE accredits the training program, not the individual, so a teacher holds a credential from a MACTE-accredited program rather than a MACTE certification. If a school says a guide is 'MACTE certified', they almost certainly mean this — but it is worth asking which program issued the credential, and for which age level.
Is a NECPA or NAEYC accredited school a good Montessori school?
It tells you something real, but not that. NECPA, NAEYC, Cognia, and Arizona's Quality First all assess general program quality — safety, staffing, administration, classroom practice — for programs of any method. None of them assesses whether Montessori is being practiced faithfully. A center can hold NECPA and run a thin Montessori program, or be rigorously Montessori with no general accreditation at all. Look for one credential from each column.
Why does any of this matter?
Because 'Montessori' is not a trademark. Anyone can open a school and use the name, with no obligation to follow the method. Credentials from AMI, AMS, IMC, or a MACTE-accredited training route are the main independent signal a family has that a school is what it says it is.
azmontessorischools.com is an independent directory and is not affiliated with AMI, AMS, the IMC, MACTE, or any school listed here.