Two of the most interesting conceptual turns in Richard E. Snow's thinking called for: a broadening of the concept of aptitude to include not only cognitive processes, but also affective and cognative processes as essential for understanding academic performance and learning; and an exploration of the possibility that individual differences in learning and achievement emerge from dynamic person-situation transactions that unfold over time. The articles in this special issue address these "big ideas" through the lens of a study of high school students' achievement in science.
Volume 8, Number 2, 2002Contents: R.J. Shavelson, R.W. Roeser, H. Kuppermintz, Richard E. Snow's Remaking of the Concept of Aptitude and Multidimensional Test Validity: Introduction to the Special Issue. C.C. Ayala, R.J. Shavelson, Y. Yin, Reasoning Dimensions Underlying Science Achievement: The Case of Performance Assessment. H. Kuppermintz, Affective and Conative Factors as Aptitude Resources in High School Science Achievement. S. Lau, R.W. Roeser, Cognitive Abilities and Motivational Processes in High School Students' Situational Engagement and Achievement in Science. A.M. Haydel, R.W. Roeser, On Motivation, Ability, and the Perceived Situation in Science Test Performance: A Person-Centered Approach With High School Students. R.W. Roeser, R.J. Shavelson, H. Kuppermintz, The Concept of Aptitude and Multidimensional Validity Revisited.