Maria Montessori 
Montessori Method [PDF ebook] 
Scientific Pedagogy as Applied to Child Education in "the Children’s Houses", With Additions and Revisions by the Author

The Italian edition of It Metodo della Pedagogia Scientifica had no preface, because the book itself I con sider nothing more than the preface to a more compre hensive work, the aim and extent of which it only indi cates. For the educational method for children of from three to six years set forth here is but the earnest of a work that, developing the same principle and method, shall cover in a like manner the successive stages of education. Moreover, the method which obtains in the Case dei Bam bini offers, it seems to me, an experimental field for the study of man, and promises, perhaps, the development of a science that shall disclose other secrets of nature.