The topic of personality development lies at the interface of two larger and more familiar topics: personality theory and developmental psychology. However, as the present summary will demonstrate, most explorations of personality development focus on broad issues of identity and not on the narrower personality traits and dispositions that dominated the field of personality theory during the end of the 20th century. For all intents and purposes, the topic of personality development could as easily be termed “person development.” In ways that will be made clear in this chapter, most people undergo significant psychological change as they age. With respect to their psychological characteristics, infants become children, who become adolescents, who then become adults. These progressive age-related changes are much more than ...