Among the five theories of development, I would like to describe and explain two major theories, cognitive theory and behaviorism. The main concepts of cognitive theory focus on the process of thought development and how this process affects our actions, attitudes, beliefs, and assumptions throughout life. Jean Piaget, a Swiss biologist and supporter of cognitive theory, developed a general thesis on cognitive theory; he divided the process of thought development into four stages. He stated that "the way people think changes with age, as their brains mature and their experiences challenge their past assumptions (Berger, 8th edition, 2009)." In my opinion, we use and apply the main concepts of cognitive theory in everyday life, such as family relationships, friendships, partnerships and work relationships. I personally believe that I would never succeed as a person, partner, student or later as a social worker without the core concepts of cognitive theory. I want to share an example of cognitive theory from my own personal experiences, and subsequently how my experiences challenged my past assumptions. When I was a child, I met very few children with special needs. I never understood them and they never wanted to play with me or my friends. Because of these experiences, I assumed and believed that children with special needs were stupid, useless, and a waste of time. After I graduated high school, I really started thinking about the next steps in my life. I didn't know what I wanted to do and I didn't have the training required to start a new job. Therefore, I enrolled in a college majoring in social studies. During my studies, I met many adults and children with special needs. They were different and "special" but they certainly weren't... middle of article...... psychoanalytic theory is also very important because it focuses in part on past experiences, especially childhood experiences that generally shape the adult personality. and behavior. I simply disagree with Freud's belief that human behavior was driven by unconscious conflicts that were almost always sexual or aggressive in nature. Sociocultural theory focuses on the cultural and social factors that influence human development, but it is very limited because it ignores the rest of the factors that shape and affect our development throughout life. Epigenetic theory focuses on genes and genetic predisposition, which is very important because genes always affect our development, but is limited because it ignores upbringing issues. Personally, I would choose and use concepts from these five theories to examine a problem and, therefore, find a solution to solve a problem..