Defines Montessori theory in terms that can interface with developmental psychology, summarizing adolescent cognitive, social, emotional, and moral outcomes. Focuses on outcomes of the third plane of education for youth in an Erdkinder setting, Montessori's "Educational Syllabus," providing clues about the future Montessori adult. Suggests that the emotional dimension of the early adolescent stage might be viewed as the end state for childhood. (Author/KB)