Douglas Kleiber argues that the value of leisure for development lies in the particular experiences derived from those leisure activities. Experiences that fulfill a need for autonomy, competence, self-expression, and relatedness that provide a dialectical response to one's prevailing patterns of living or that address age-related tasks are generative of development and self-actualization. Kleiber reviews the predictable changes in leisure behaviour over the life span, noting that activities stimulating developmental change are adopted less often and less effectively than they might be. He then considers the role that leisure experience can play in addressing the problems of socialization, identity formation, and adjustment to life circumstances, concluding with a discussion of optimizing leisure later in life.