r, Beyond Formal Operations: Models and Methods in the Study of Adolescent and Adult Thought, volume 2, pages 63-78. 1990. KLH83. Lawrence Kohlberg, Charles Levine, and Alexandra Hewer. Moral stages : a current formulation and a response to critics. Karger. Basel, 1983. Koh3s. Wolfgang Kohler. The Place of Valu