What is the Montessori Concept of Discipline? Discipline is the second Prerequisite condition for learning. Montessori discipline is an "inner discipline." An inner control that the child develops Over his/her own behavior through working with the challenging Montessori materials. Dr. Montessori noted that many so-called undisciplined children were really frustrated because of a lack of proper stimulation and inadequate opportunities to achieve. She noted that they became happier and self controlled after a period of time in a Montessori classroom in which they experienced challenging tasks that absorbed their energies and resulted in a sense of achievement.