Lawrence Kohlberg’s theory of moral development is an expansion of Jean Piaget’s interest in identifying the particularities of ethical evolution. The book The Moral Judgement of the Child summarizes Piaget’s research in rule understanding and social norms revealed through the collective game governed by rules and the analysis of stories made by children regarding “bad deeds”, such as stealing or lying. According to Kohlberg, the ontogenesis of morality has a hierarchical structure with two dimensions: levels and stages.
Sigmund Freud is regarded as the father of psychodynamic theories, the founder of psychoanalysis and the creator of psychosexual stages theory of human development.
Regardless of the acceptance or disapproval of his ideas about human development, his influence over psychology was enormous. During a puritan era he managed to construct a theory of unconscious motivation, of human sexuality and instinctual aggression.
Erikson was a stage theorist who took Freud’s controversial theory of psychosexual development and modified it as a psychosocial theory, as he rejected the central importance of the sexual drive in favour of the progressive emergence of identity. Like Freud and many others, Erik Erikson maintained that personality develops in a predetermined order, and builds upon each previous stage. This is called the epigenetic principle.
The American psychologist Jerome S. Bruner, strongly influenced by the work of Russian psychologist Lev Vygostky, further developed and applied his ideas in the field of education. Bruner declared that Vygotsky has convinced him about the impossibility of understanding the concept of human development in any other way than as a process of assistance, of collaboration between child and adult, where the adult is taking up the role of a sociocultural mediator. Due to its distinct features, we consider the theory to be a sociocultural constructivist one.
Jean Piaget’s theory of cognitive development (1935) explains how a child constructs a mental model of the world. He disagreed with the idea that intelligence was a fixed trait, and regarded cognitive development as a process which occurs due to biological maturation and interaction with the environment.
Jean Piaget’s take on learning, viewed as a modification in the state of knowledge, coherently integrates itself in the group of piagetian research on the subject of intelligence development.