The study of identity development, the psychological description of how individuals form an identity as they mature from childhood into adulthood, was the foundation out of which much of identity research began and exponentially grew through the last half of the 20th century until today. With its roots in the early emergence of developmental stage theory, the field of identity development has grown increasingly mature as it has moved beyond simpler categories of stages and statuses into more complex interdisciplinary research involving cultural, cognitive, and neurological components of the developing human ...