1. The document discusses Jean Piaget's theory of cognitive development and how it influenced Maria Montessori's educational methods.
2. Piaget's theory proposed four stages of cognitive development - sensorimotor, preoperational, concrete operational, and formal operational - defined by characteristics like object permanence and logical thinking abilities.
3. While Piaget and Montessori both emphasized how the environment shapes learning, they differed on whether the child or environment is more active in this process. Montessori may have based her methods on Piaget's cognitive constructivism theory.