Rational numbers (i.e., fractions, percentages, decimals, and whole-number frequencies) are notoriously difficult mathematical constructs. Yet correctly interpreting rational numbers is imperative for understanding health statistics, such as gauging the likelihood of side effects from a medication. Several pernicious biases affect health…

Several studies have applied the dichotomy of deep and surface approaches to learning in a range of disciplinary contexts. Existing questionnaires have largely assumed the existence of these constructs; however, in a recent study Case and Marshall (2004) described two additional context-specific approaches to learning in engineering. The current…

A commentary is made on each of five symposium papers on the unification of cognitive process theory and differential psychology. Future research directions are reviewed within a new theoretical framework as to the process nature of aptitudes and general intelligence. Future psychometric directions and educational implications are discussed. (RD)