Essays on Moral Development. Vol. 1, The Philosophy of Moral Development. San Francisco: Harper & Row, 1981. Essays on Moral Development. Vol. 2, The Psychology of Moral Development. San Francisco: Harper & Row, 1984.
With Anne Colby. The Measurement of Moral Judgment. Cambridge, UK: Cambridge University Press, 1987.
With F. C. Power and Ann Higgins. Lawrence Kohlberg's Approach to Moral Education. New York: Columbia University Press, 1989.
rather than a researcher, but he was captivated by the writings of the Swiss child psychologist Jean Piaget (1896-1980)—particularly Piaget's account of the moral development of children. Piaget maintained that children's processes of moral reasoning changed as they grew older. In 1955 Kohlberg began a research project for his doctoral dissertation that involved interviewing 72 male children and adolescents about moral issues. Kohlberg used the now-famous dilemma of "Heinz," reprinted in the accompanying sidebar, to draw out his subjects' patterns of moral reasoning, as well as to elicit their specific answers to the dilemma. Kohlberg discerned six stages of moral development, divided into three levels, in the material that he outlined in his dissertation. These stages ranged from a preconventional stage, characterized by self-interest, to higher stages associated with subscription to conventional moral standards for the good of society, as well as a specific stage that Kohlberg defined as "postconventional morality." Kohlberg identified postconventional morality with moral reasoning based on the principles underlying ethical rules and norms, rather than on uniform applications of rules. When the dissertation was published in 1958, Kohlberg received his choice of job offers from several prestigious institutions.
Kohlberg first accepted an assistant professorship in the psychology department at Yale University in
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