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Major Child Development Theories and Theorists Angela Oswalt, MSW Though many scientists and researchers have approached the study of child development over the last hundred or so years, only a few of the theories that have resulted have stood the test of time and have proven to be widely influential. Among this core group of theories are five that will serve as the basis for the documents in this series. These are:
Freud's psychosexual stage theory
Erikson's psychosocial stage theory
Kohlberg's moral understanding stage theory
Piaget's cognitive development stage theory
Bronfenbrenner's ecological systems theory
