Developmental psychologists study the physiological, cognitive, and social development that takes place throughout life. They study age-related changes in behavior and physiology, and are interested in both
common stages of development, as well as individual differences among people at the various stages of development. Some specialize in behavior during infancy, childhood, and adolescence, others focus on the changes
that occur during maturity or old age. They may also study developmental disabilities and their effects.
Developmental psychologists typically focus on research and teaching, although many also provide consultation to programs dealing with children. Psychologists are also involved in the assessment of programs
geared to individuals at vrious developmental stages, to determine whether interventions are successful.