Reviews concepts of aptitude and aptitude-treatment interaction (ATI) and summarizes lessons learned in ATI research on educational treatments to help ATI research on psychotherapeutic treatments. Research design and data analysis recommendations address aptitude distributions, multivariate aptitude complexes, detective work with scatterplots,…

Examined the hypothesis that the variability between adults increases with the age of the population. Conducted two reviews to ascertain the status of the empirical support for this hypothesis. Neither literature search provided any convincing confirmation of this hypothesis. Cites implications of this finding for professionals in gerontology.…

Many educational questions of research interest focus on individual differences in attitudes and behaviors related to academic achievement, changes in such attitudes and behaviors over time, and the types of academic environments that facilitate or prevent development of achievement attitudes and behaviors at school. This paper, the first in a…