For Researchers

Evidence-grade material: cited, dated, and honest about its own limits. No organisation is treated here as more authoritative than the evidence it can point to; see the editorial policy for the full standard this section holds itself to.

• Evidence Status: what the research currently supports, including a live, unresolved disagreement over how strong it is, with a 2026 review reaching a sharply different conclusion from the 2023 syntheses, and a 2025 lottery-based trial whose results differ by outcome. Start here if you want the single most important page in this section.
• Maria Montessori: a Fuller Biography: the adult-level account, including the parts a celebratory biography would leave out.
• Historical Timeline: dated events with a copyright-status annotation on every publication.
• International Comparative Data: worldwide school counts, funding splits, and detail on the Netherlands, the UK and India.
• Annotated Bibliography: full citations, methodology-quality flags, and known gaps stated openly rather than implied away.