Maria Montessori illustrated beautifully and scientifically four planes of development. Proven fact, It is a journey of a Child to his or her Adulthood. Montessorians United & Kido Montessori materials illustrated this fundamental aspect of child growth in self explanatory way. This can totally change your view of how children learn!

"Education should not limit itself to seeking new methods for a mostly arid transmission of knowledge: its aim must be to give the necessary aid to human development. This world, marvellous in its power, needs a "new man." It is therefore the life of man and his values that must be considered. If "the formation of man" becomes the basis of education, then the coordination of all schools from infancy to maturity, from nursery to university, arises as a first necessity: for man is a unity, an individuality that passes through interdependent phases of development. Each preceding phase prepares the one that follows, forms its base, nurtures the energies that urge towards the succeeding period of life." (From Childhood to Adolescence, p. 84)
                                                                                                           By Maria Montessori