The testing effect, defined as the positive effect of "retrieval practice" (i.e., self-testing) on long-term memory retention relative to other ways to support learning, is a robust empirical phenomenon. Despite substantial scientific evidence for the testing effect, less is known about its effectiveness in relation to individual…

This study extends the previous literature by identifying different subtypes of language disability within learning disabled children. Results indicate that six language subtypes can be derived and that they are both internally consistent and externally valid, being differentially linked to reading and math achievement over a three-year period.…

Root word vocabulary was studied in two normative samples (English-speaking, wide socioeconomic range) and in an advantaged sample. Findings suggest that greater efforts should be made to foster vocabulary acquisition in the primary years, and that a rough vocabulary curriculum sequence can be identified for the elementary years. (Author)