This document discusses development stages in middle and late adolescence. It defines the age ranges for early, middle, and late adolescence. Middle adolescence is defined as ages 14-16, and late adolescence as ages 17-20. Erik Erikson's stages of psychosocial development are summarized, including the identity vs. role confusion stage that occurs during adolescence from ages 12-18. Physical, emotional, cognitive, and social changes that occur during adolescence are outlined. Key issues teenagers face related to social development like self-esteem and peer pressure are also discussed. Skills and tasks appropriate for middle and late adolescence are listed.