| You mean of the critique of Maria Montessoris education in general? Then i'd refer you the 1914s Text from Kilpatrick (From the same time than Montessori, a progressive Educator himself) https://archive.org/details/montessorisystem00kilprich I just chuckeled as i re-read his accounts of her arithmetics material: "On the whole, the arithmetic work seemed good, but
not remarkable; probably not equal to the better
work done in this country. In particular there is
very slight effort to connect arithmetic with the
immediate life of the child. Certainly, in the
teaching of this subject, there is for us no funda-
mental suggestion. " Mind you, that's from 1914. Pedagogics have improved since then... Or do you mean a better understanding how pre-numeric mathematic works? Most efforts are built around Piagets Teachings (Not very scientific as he "just" observed his own three children)
https://en.wikipedia.org/wiki/Piaget%27s_theory_of_cognitive... One sample of such a adaptations for pre-numerics (not Geometry) are the works of Carin de Vries (sadly only in German): http://oops.uni-oldenburg.de/1014/1/vridia10.pdf |
Kilpatrick was a disciple of Dewey; both were known haters of Maria Montessori and her work, and never gave any specific criticism of her system, just appeals to their own authority; they basically rejected her purpose in education (developing the faculty of reason, learning writing, reading, arithmetics, and geometry) because of their progressive-education, anti-reason dogma.
There isn't much difference between the insights of Montessori and Piaget. Piaget worked with Montessori early in his career. The experimental nursery school in Geneva, La Maison des Petits, where Piaget carried out his first studies of children in the 1920s, was a modified Montessori institution, and Piaget was the head of the Swiss Montessori Society for many years.
Jean Piaget was a great scientist who conducted systematic experiments with countless children. Your claim that he only observed his own 3 children is a lie. Scientists at the University of Geneva to this day carry on with his research and experiments.
That last reference you provide is some obscure German PhD thesis which does not reference Montessori's work at all; it has a major focus on teaching mentally retarded children, as well as teaching mathematics out of books to children older than the ones that go to Montessori schools (commonly age 3-6).