Researchers across many fields have called for greater attention to heterogeneity of treatment effects--shifting focus from the average effect to variation in effects between different treatments, studies, or subgroups. True heterogeneity is important, but many reports of heterogeneity have proved to be false, non-replicable, or exaggerated. In…

This paper probes into implicit language aptitude (LA), a set of cognitive abilities that showcase learners' unconscious, automatic second language (L2) attainment. Implicit LA is becoming an important part of aptitude research, and advances the understanding of L2 learning mechanism. This paper critiques the construct of implicit LA and proposes…

NEW INTELLECTUAL APTITUDES WERE INVESTIGATED TO DETERMINE TO WHAT EXTENT THEY INFLUENCE ACHIEVEMENT IN NINTH-GRADE ALGEBRA AND GENERAL MATHEMATICS COURSES. TESTS AND CRITERIA WERE COMPLETED FOR APPROXIMATELY 400 STUDENTS IN THE NINTH GRADE. THEY WERE ENROLLED IN ONE OF FOUR MATHEMATICS COURSES AND ADMINISTERED ACHIEVEMENT EXAMINATIONS UPON…

Criticizes the Detroit Tests of Learning Aptitude 2 (DLTA-2): (1) scoring criteria for the Story Construction Test are questionable; (2) the Word Fragment Test may not be practically significant; (3) the Picture Book is inconvenient to use without an index or table of contents. One major strength is the provision for combining subtest scores. (SRT)

A description is made of the first steps taken towards the development of a model of epistemic beliefs, which is conceptually based on the learning process. In two studies, which were conducted in the domains of mathematics and physics, a quest was made to secure the first evidence of the usefulness of the model. The most important results of the…