reasoning. Kohlberg agreed with Piaget's theory of moral development that moral understanding is linked to cognitive development. His three levels were categorized as: preconventional, conventional, and postconventional, all of which have two sub-stages. James W. Fowler (b.1940), and his stages of faith development theory, builds off of both Piaget's and Kohlberg's schemes. Learning and education Maria Montessori (b.1871) described a number of stages in her educational philosophy. Albert Bandura (b.1925), in his social learning theory, emphasizes the child's experiential learning from the environment. Spirituality and consultancy Inspired by Theosophy, Rudolf Steiner (b.1861) had developed a stage theory based on seven-year life phases. Three childhood phases (conception to 21 years) are followed by three stages of development of the ego (21–42 years), concluding with three stages of spiritual development (42-63). The theory is applied in Waldorf education Clare W. Graves (b.1941) developed an emergent cyclical levels of existence theory. It was popularized by Don Beck (b.1937) and Chris Cowan's as spiral dynamics, and mainly applied in consultancy. Ken Wilber (b.1949) integrated Spiral Dynamics in his integral theory, which also includes psychological stages of development as described by Jean Piaget and Jane Loevinger, the spiritual models of Sri Aurobindo and Rudolf Steiner, and Jean Gebsers theory of mutations of consciousness in human history. Other theories Lev Vygotsky (b.1896) developed several theories, particularly zone of proximal development. Other theories are not exactly developmental stage theories, but do incorporate a hierarchy of psychological factors and elements. Abraham Maslow (b.1908) described a hierarchy of needs. James Marcia (b.1937) developed a theory of identity achievement and identity status. References