A professor at Harvard Graduate School of Education, his experience and observation of how his students developed and progressed intellectually and cognitively has allowed him to develop a theory that traces the evolution of the 'traditionally aged' students thinking in terms of the nature of knowledge, truth, values, meaning of life and responsibility (OUE, 2088). Essentially what it is about is an expansion of Piaget's theory - based on his observation of his students, he lists the process ...