Piaget’s theory in my daily lives experience Psychology is a fascinating subject to me. The study of which gives me an overview towards the human behavior and mental processes. I do realize the discipline relying on the scientific method and empirical evidence after enrolling in this subject. Some theories taught throughout the past lectures, such as the structure of personality in Freud’s theory and Maslow’s humanistic theories, arouse my curiosity to link the discipline and daily life events together. Among these theories, Piaget’s theory of cognitive stages has interested me most. According to Piaget, there are 4 cognitive development stages of children, including sensorimotor, preoperational, concrete operational and formal operational. The stage I would like to talk about is the preoperational stage because some of the features are reflected in my seven‐year‐old sister. My sister is studying in primary two. She is an ordinary P.2 student and a child with normal I.Q. As I often teach her Mathematics, I learn that she has difficulty on doing some mental operations and thinking abstractly. For instance, she can answer single‐digit‐multiplication quickly by reciting multiplication table but not able to answer double‐digit‐addition and subtraction and reverse calculations. Instead, she does finger counting and working on the paper to figure out the answer. The second example is I do spend more than three hours to explain how “hours and minutes” in concept of time