To illuminate individual differences in the development of attention-deficit hyperactivity disorder (ADHD) symptoms in the general population, psychometric measures are needed that can capture general population-level symptom variation reliably, validly, and comparably from childhood through to the transition to adulthood. The ADHD subscale of the…

The satisfaction of adolescents' perceived psychological needs facilitates their academic achievement and adjustment within school. A first step in this direction is the identification of adolescents' psychological needs and the environmental factors to meet these needs. Based on the theory of Existence, Relatedness, and Growth, known as ERG, the…

The Psychological Growth Index, a true-false questionnaire of 140 items, has been administered to 7,500 individuals in the 14 to 22 age group to distinguish psychologically mature adolescents from less-fully mature peers. Author claims after careful statistical scrutiny instrument remains clinically valid. (DS)

The psychosocial inventory of ego strengths (PIES) was devised as a measure of Erikson's eight ego strengths. The present investigation extended previous research through examination of the validity and reliability of the PIES among 502 high school students. The study also included an appraisal of Erikson's ego strengths as indices of psychosocial…