This article presents three studies, two of them longitudinal, which investigated the relations between age, processing speed, working memory (WM), and fluid intelligence ("g[subscript f]") from 4 to 16 years of age. Structural equation modeling showed that speed was a powerful covariate of age ([approximately] - 0.6 to - 0.7) from 4 to 13 years,…

Preparing every student to be college and career ready by the time they graduate from high school has become a national policy priority. Although a variety of academic skills are required for postsecondary success, mathematics achievement is a particularly influential factor in college and career readiness (Pellegrino & Hilton, 2012). Research…

The purpose of this research was to investigate the cognitive abilities that explain reading comprehension across childhood and early adulthood. Drawing from the standardization sample of the Woodcock-Johnson III, analyses were conducted with large samples at age levels spanning early childhood to early adulthood: 5 to 6 (n = 639), 7 to 8 (n =…

This study investigated the structure and development of processes involved in "g." One hundred and forty children, about equally drawn among primary school grades 1-6 were examined by four types of Stroop-like speeded tasks addressed to processes of increasing complexity (i.e., speed of processing, perceptual discrimination, perceptual control,…

Examined development of child and adolescent self-concept in two overlapping age cohorts as a function of the self-concept domain, social/developmental/educational transitions, and gender. Structural equation modeling addressed questions about stability of individual differences over time. Multilevel modeling addressed questions about mean-level…