This master's thesis will present the theory of intellectual development according to Jean Piaget, explain all the phases mentioned in the theory of development and try to find out what contemporary pedagogical implications are when we talk about intellectual development. The aim is to relate the theory with pedagogical practice and to find the links that prove the theory itself, the possibilities of its implementation in the pedagogical process and the characteristics of the development phases according to Jean Piaget's theory. Furthermore, the features of intellectual education will be explored, along with how much intellectual education is important and in which ways it is promoted. Jean Piaget explores and explains the child's abilities, how a child thinks and learns from the very beginning until the end of the adolescence when the cognitive development is stopped. He considers the child as an individual who is at a certain age able to perceive things around him, to perceive the relationships between himself and the world and is able to solve the problem that comes before him. Jean Piaget's intellectual development theory is of utmost importance for pedagogical practice, as it provides guidelines for competent pedagogical work to his postulates.