The concept in Psychology 1001 that I feel will stick with me most in five years is Jean Piaget's stages of cognitive development. Whether I'm still working as a nanny for young children or have some of my own at home, I will remember his theories of child development and put those to use in my everyday life. From object permanence to egocentrism and conservation, Piaget's work has put a name to some phenomena that I've noticed before but never fully understood until he explained it. The most interesting aspect to me is that some children reach the stages of development earlier than others and are already mentally capable of deconstructing abstract tasks, experimenting systematically and reasoning hypothetically beyond the here and now. It's amazing to me that until the concrete operational stage, around age seven, children cannot perform mental transformations and mentally conserve amounts of objects. Understanding of these concepts allows me to interact with children better because I have a more thorough idea of their cognitive abilities and, concurrently, their motivations. I hope that I will remember most of the concepts I've learned in Psych 1001, but this is the one that I don't think I'll ever forget.