Gerald Malcolm Durrell was born in Jamshedpur, Bihar Province, India, on 7 January 1925, the fourth surviving child of Louisa Florence Durrell (nee NÃ©e), dixie aged-thirty, eight And Lawrence Samuel, durrell, forty a civil. engineer
In the 20th century, an American psychologist named Lawrence Kohlberg developed a model that explained how individuals develop morality. This model is known as Kohlberg's Stages of Moral Development. Kohlberg's model is composed of three stages, each of which includes two phases. The three stages are preconventional morality, conventional morality and postconventional morality.
Stage Four: The Formal Operational Stage of Development. As mentioned earlier, there are four stages of cognitive development. The final stage is known as the formal operational stage and is present when someone reaches about the age of 12 and continues into adulthood.ean Piaget was a psychologist who studied cognitive development and formed a theory based on his observations of human growth. Jean Piaget identified these four stages as follows: sensorimotor, pre-operational, concrete operational, and formal operational.