“People have looked at these questions from every possible angle. Abraham Maslow famously looked at how human needs evolve along the human journey, from basic physiological needs to self-actualization. Others looked at development through the lenses of worldviews (Gebser, among others), cognitive capacities (Piaget), values (Graves), moral development (Kohlberg, Gilligan), self-identity (Loevinger), spirituality (Fowler), leadership (Cook-Greuter, Kegan, Torbert), and so on.”