What Academic Studies Show

A large systematic review of 32 controlled studies found that Montessori students outperform their peers in traditional education on a range of academic measures, including general academic ability, language/literacy, and mathematics. Overall, the review estimated that Montessori students perform about a quarter of a standard deviation higher — roughly equivalent to a year’s worth of learning advantage — compared with traditional schooling. - https://pubmed.ncbi.nlm.nih.gov/37554998/

The same rigorous meta-analysis concluded that Montessori schooling has meaningful benefits both academically and socially, with students performing higher in areas such as executive function, self-control, and well-being at school, alongside academic gains — especially in early and primary years. https://evidencebasedliving.human.cornell.edu/uncategorized/what-the-evidence-says-about-montessori-education/

Further summaries of the meta-analysis note that in real-world educational settings (as opposed to tightly controlled lab conditions), Montessori students tend to perform consistently better in academic achievement compared with peers in conventional schools https://www.campbellcollaboration.org/review/montessori-impact-on-academic-and-nonacademic-outcomes/

Other research (e.g., aggregated data from Montessori schools compared with district scores) indicates that Montessori students are more likely to be proficient on standardised English/Language Arts tests, with smaller opportunity gaps across socio-economic grouphttps://www.montessoripublicworks.org/research-outcomes?