This volume collects Maria Montessori's texts from her late work, which primarily contain her ideas for reforming secondary school and university, but also some contributions to the further development of her primary school concept. The focus is on the design of the school as an "experience school of social life", as summarized in the well-known "Erdkinderplan", which was first published in English in 1939. Author portrait Prof. em. Dr. Harald Ludwig, Institute for Educational Science at the University of Münster; Focus: reform pedagogy / Montessori pedagogy; Head of the Montessori Research Center. Dr. Michael Klein-Landeck, comprehensive school teacher; Lecturer at the University of Hamburg; Editor of the magazine MONTESSORI and theory lecturer in Montessori training courses; Author of several books on Montessori education.