School interventions are often based on the assumption that such variables as self-concept and locus of control should have a meaningful impact on achievement. Yet research support for such influence is inconsistent. Because this inconsistency may be due to methodological problems, a study was conducted which used path analysis to determine the…

Causal path analysis was used to determine the direct and indirect influences of intellectual ability, quality of instruction, achievement motivation, quantity of academic coursework, and time spent on homework on high school students' learning, as measured by their grade point averages (GPAs). Other relevant influences on grades were controlled.…