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Sounds good. The school systems are messed up, everybody agrees on that. But the article is missing out the underlying cause for the results. What exactly caused the beneficial outcome? Montessori itself is quite a vast term nowadays.
Is “Montessori” sufficiently defined?

I compared Montessori and non Montessori labeled daycares/preschools for my 3 and 4 year olds, and was unable to discern a meaningful difference in the course of the day.

Edit: I ended up going with the daycare that had cameras (so that at least management could audit employees), and a livestream for the parents, which was at a non Montessori daycare. Staff turnover also seemed lower. Was more expensive, but have been happy with results.

As a product of public montessori, I couldn't agree more
As someone who has worked in education for about a decade now, I use this quote a lot:

You can’t understand Google unless you know that both Larry and Sergey were Montessori kids. — Marissa Mayer

Any alternative school system is lower-cost than public schools if they don't have to support the needs of students with severe disabilities.
Only one-fifth of parents gave permission to participate in the study, the schools differed in how “authentic” their Montessori approach was, and the measurements only go up to the end of kindergarten. So we do not know whether the differences persist.
Table S34 shows that over 20% of the control group either stayed home or didn't provide info on what they did. (Compared with ~4% of the intent-to-treat group)

So, sadly, they weren't able to directly compare 'public Montessori PK3' with 'public non-Montessori PK3'.

That lowers the statistical power of the experiment. It does not bias it. That's the beauty of intention-to-treat designs: they trade away bias for lower power -- a worthwhile trade every day of the week.
I send my child to a private Montessori school. With that said, there's no denying that sending your child to a private Montessori school is similar to parents who buy books in learning to parent are typically better parents not because they read the books but because they care enough to buy the books. If you care enough to send your child to a Montessori school, the parent is invested in the child's success and I think that's way more important.
My children attended Montessori schools, and it really is a wonderful system.

I would really like to see an extension of this learning method up through high school --- the closest thing I'm aware of was a school I attended in Mississippi for a couple of years --- classes were divided between academic and social, social classes (homeroom, phys ed, social studies, &c.) were attended at one's age, while academic classes (reading, math, science, geography, history, &c.) were by ability (with a limit on no more than 4 grades ahead up to 8th grade) --- after 8th grade that was removed and students were allowed to take any classes.

Some of the faculty were accredited as faculty at a local college, and where warranted, either professors travelled from there to the school, or students travelled to the college for classes --- it wasn't uncommon for students to graduate high school and simultaneously be awarded a college degree.

Apparently, the system was deemed unfair because it accorded a benefit to the students who were able to take advantage of it, with no commensurate compensation for those who were not, so the Miss. State Supreme Court dismantled it.

> (with a limit on no more than 4 grades ahead up to 8th grade) --- after 8th grade that was removed and students were allowed to take any classes.

Unless this school had more than 12 grades, why would you describe that as "the limit being removed"?

I’ve been advocating for this for years so I’m glad to hear you had such a good experience.

At the elementary level, up until about 3rd or 4th grade it always made more sense to me to have lots of smaller “neighborhood” level Montessori schools rather than a few large schools from Kindergarten - 6th.

There was a lot of experimentation with education methods in the 1970's, of which I benefited. I miss the way that decade began for the optimism and courage to experiment.
I went to a Montessori school from pre-K through 6th grade. I totally agree with this article. It is not easy to make this work on a public school-sized scale. The problem in education is not funding. We were a private school, but we made it work on a shoestring.
They make it work as a public schooling system in Amsterdam. About 10% of the public schools are Montessori.
Might be due to many other things than the Montessori methodology. Such as peer quality and teacher quality, potentially better and more expensive/healthy lunches or a million other things.
Most of public schools over the world struggle with much more basic problems than methods or programs. The most important thing IMHO is a stable environment. You can use the very best methods and programs, but if teachers change frequently, like it become more and more a norm in public schools, all these don't matter much really.
Given all the money spent on trying different educational models to achieve better outcomes, it's really gratifying to see a result suggesting that improvement is actually possible. I have a lot of teachers in my family and they tend to take the perspective that education is an engineering problem rather than a research problem. That is, any apparent progress is due to extra funding or filtering students or the like.

> "Those costs do not include anticipated savings from improved teacher morale and retention, a dynamic demonstrated in other data."

That seems like some kind of supportive evidence as well. Teachers should logically be happier when working inside a system optimized for teaching efficacy!

Personally: we put our child in a Montessori preschool because we liked its emphasis on self-directed learning (I kind of think all learning has to be self-directed on some level. Even a lecture requires you to listen to and think about the lecture, instead of something else). We later moved him to a Reggio Emilia program for non-pedagogical reasons (there were problems with the building that the Montessori school was in). They're definitely different—in Montessori, he mostly played on his own, and in Reggio we now see him in pairs and groups all the time. I have no idea which is better, but his teachers at the Reggio school seem to like it.

My kids went to Montessori school, first private which was good, they learned a lot of life skills, not so much academics tbh, which is why I switched them to public Montessori, which was in name only.

What worked for us better is competence grading which is Summit system that originated in California.

But principles are system are great, if you can make it work. It requires effort from teachers and parents and all. It is not trivial to make it work everywhere.

So long as it's a true Montessori and not just in name only. The number of programs I see touting Montessori, Classical, and other models is wild. Usually it's charter and private schools that say one thing but do another.
My children could read at 4 and we were told that the Montessori school would not let them read because it was age-inappropriate. We did not enroll.
The article doesn't really address why Montessori programs performed better at lower costs: these classrooms emphasize self-directed, hands-on learning where children choose activities based on their interests, driving independence and curiosity. Traditional classrooms follow a rigid teacher-led curriculum with structured lessons and uniform pacing for all students.
I want to offer a different data point. I took my daughter to a Montessori-adjacent school for 3 years. It's not Montessori exactly and they didn't advertise as such but they had a different European name attached to it that is downstream from Montessori. They had multi-age education, stressed in children directed learning and individual growth, they didn't have exams, etc.

I changed my daughter this year and overall I'm disappointed in that school. There were many issues but the most important ones to me where:

- No exams, only individual growth meant there's no guarantee the kid is learning at a good pace. When I worked with her at home I could easily identify many gaps and deficiencies. She's now struggling a bit in her new school because of this but I think it will resolve soon.

- Because they didn't like comparing kids to standards or among each other the feedback I received was useless. It was always "she's doing excellent, we see strong growth" but it wasn't true.

- The school rejected most parent feedback and issues raised with something "maybe this style of education is not for you". For example, I know of a few other kids that had to leave because the school didn't take action against bullying because they didn't believe in punishments, etc.

I have to say there were good things too, in particular my daughter really enjoyed it there and formed strong bonds with other kids. I think in general it was ok for elementary education but I strongly think it's not after that and I now have a perhaps unjust bias against Montessori and derivatives.

Having been through Montessori, I think it's fantastic for kids that are naturally self-driven. I had a great time when it came to learning science and English (the two subjects I cared the most about).

Howrver, I was also pretty far behind in math for reasons unrelated to ability (standardized testing and secondary educational success indicate that I'm actually pretty good at math). I also left with very underdeveloped time management and study skills.

Could these downsides have been mitigated? Definitely, and my parents largely made sure they were. But in talking to my peers at the time, my parents after the fact, and parents of to hers that went to Montessori schools, I think the general idea holds.

Point being that self driven education is fantastic for a lot of reasons. But it will also let a lot of kids stay far behind their ability if not carefully monitored.

I went to a Montessori school in the Netherlands and feel like it failed me. Just one data point and maybe it was just a bad school.

I have autism and nobody noticed or did anything about it until it was time to start preparing for high school in seventh grade. I had read all the books in the school library but was not able to spell and write. It was just way to easy for me to escape work I did not want to do.

We moved after I started high school and my sisters had to change school because of it. One of the first things they noticed at their new school is how incredibly lazy they where.

I am very happy working as a mailman but I do wonder what I would be doing now if I had learned how to study and learn at a younger age.

There's a nonprofit Montessori school running in the biggest slum in Bangkok, Thailand which provides free schooling to the slums kids. It seems to work well.

They're always looking for foreign tourists to help teach English, even if it's just for a few days or a week.

In Manhattan, all the preschools we looked at were either Montessori style or Reggio Emilia approach. I could not detect any meaningful difference between them.
Most of my fondest childhood memories are from a short time I attended a Montessori preschool.