The researchers call Montessori's pedagogy developer or development pedagogy. In the past decade, in Hungary, it appeared as a development pedagogy in the pedagogical practice. The conductive education is a special, complex pedagogical method [6] because it takes into consideration special educational needs in planning and implementation. We can view Mária Montessori's method as a development pedagogical method because it's suitable for children with special educational needs. Her pedagogical work began with children with intellectual disabilities. The Montessori development method has not yet occurred in conductive education. With our research, we wanted to broaden the use of the Montessori method in the practice of special education and development pedagogy. We wanted to confirm the similarity and difference of the holistic approach of the two doctor-pedagogues. It's explicable with Pető's holistic approach, why didn't entrust the development of perception, speech, motion, and communication difficulties to people working in different places and time. We introduced the Montessori conductive educational practice experimentally in the semesters of 2000-2003 and 2007-2008, in accordance with the student's college education. The purpose of the program was to demonstrate the practical application of the elements of the two methods and their coordinated operation.