For example, the work of Zacharias and Bruner was based in the developmental psychology of Jean Piaget and incorporated many of Dewey's ideas of experiential education. Bruner's analysis of developmental psychology became the core of a pedagogical movement known as constructivism, which argues that the child is an active participant in making meaning and must be engaged in the progress of education for learning to be effective. This psychological approach has deep connections to the work of both Parker and Dewey and led to a resurgence of their ideas in second half of the century.