There are three different types of development that you go through. These three developments are cognitive, psychosocial and physical. First, cognitive development is development in the areas of learning, attention, memory, thinking, learning, and creativity. An example is when a child turns 12 or older and becomes able to think abstractly and logically. Subsequently, psychosocial development is the development of emotions, personality, and social relationships. An example of this is when a younger child begins to interact socially with other children. Finally, physical development is the development of the senses, motor skills, health and well-being. In other words, physical development is a change in the mind and body. One example I agree with is the theory of psychosocial development. This particular theory was created by Erik Erikson. Erikson's theory states that personality development occurs throughout life. Furthermore, Erikson believes that our interactions with others are what influence our sense of self. Erikson's theory includes eight stages that we all experience at certain parts of our lives. Each of the phases includes an “either” or “either” situation. For example, Industry vs. inferiority, which means that children between the ages of 6 and 12 develop pride and achievement, or feel inferior and inadequate. I agree with this theory because I believe that people experience these stages of life. I also believe that the stages included in this theory build on each other. Finally, I believe I have personally experienced some of these phases in my book. The theory of cognitive development also occurs in stages. Piaget believes that children create schemas to classify and interpret information. As new information is learned, schemas are adapted through assimilation and adaptation. Assimilation occurs when information is compared to what is already known and understood in that context. Adaptation occurs when schemas are modified based on new information. This process occurs when children interact with their environment. Piaget's four stages include sensorimotor, preoperational, concrete operational, and formal operational. The sensorimotor occurs between 0-2 years, the preoperative phase occurs between 2-6 years. The concrete operational phase occurs between the ages of 7 and 11, the formal operational phase occurs between the ages of 12 and beyond. During the first stage, children develop object permanence and stranger anxiety, the second stage includes pretend play and the development of the language of egocentrism. The third stage includes conservation and mathematical transformations, the last stage includes abstract logic and morality