The purpose of this study was to test the efficacy of a model of critical thinking ontogeny at the undergraduate levels in a four-year college. Critical thinking ability was considered relative to mental ability, academic performance, and academic preparation for college. Students (N=607) in many disciplinary areas took a battery of tests to…

This study attempted to discover the relative contribution to spelling achievement (the dependent variable) of each of the following independent variables: intelligence, visual memory, auditory memory, structural analysis, phonetic analysis, reading comprehension, and vocabulary. Participating in the study were 190 students from six seventh-grade…

Forty low-achieving seventh and eighth grade students were involved in a study to ascertain whether intelligence, underachievement, or the difference between aural and sight vocabularies could predict relative learning rate with respect to reading achievement gains. For purposes of the study, "relative learning rate" was defined as the ratio of…