Erik Erikson's theory of identity development best fits the author's preschool classroom approach. Erikson's theory emphasizes how a person's identity may change due to social, emotional, and cultural influences over time. A person's experiences, such as growing up in a broken family, can lead to behaviors influenced by their personality. By understanding a student's family background and experiences, the author can tailor their teaching strategies and lesson plans to better meet each student's needs and make learning more meaningful.