<Li> Michael Lamport Commons proposed the model of hierarchical complexity (MHC) in two dimensions: horizontal complexity and vertical complexity (Commons & Richards, 2003, p. 205). </Li> <Li> Kieran Egan has proposed five stages of understanding: "somatic", "mythic", "romantic", "philosophic", and "ironic", which is developed through cognitive tools such as "stories", "binary oppositions", "fantasy" and "rhyme, rhythm, and meter" to enhance memorization to develop a long - lasting learning capacity . </Li> <Li> Lawrence Kohlberg developed three stages of moral development: "Preconventional", "Conventional" and "Postconventional". Each level is composed of two orientation stages, with a total of six orientation stages: (1) "Punishment - Obedience", (2) "Instrumental Relativist", (3) "Good Boy - Nice Girl", (4) "Law and Order", (5) "Social Contract", and (6) "Universal Ethical Principle". </Li> <Li> Andreas Demetriou has expressed neo-Piagetian theories of cognitive development . </Li>

When do individual differences in cognitive development become more evident and more important