The Reading Comprehension and Spelling subtests of the Stanford Achievement Test were administered to 170 eighth grade students to test four null hypotheses about the differences between reading ability, spelling ability, and phonic generalization spelling errors. In addition, a specially constructed Phonics Generalization Spelling Test was…

To investigate age-and ability-related differences in the effects of explictness reversibility, and clause order on children's comprehension of causal relationships, three experiments were conducted at grade levels three, five, and eight. Students read text in one of four formats. Several age differences, but no ability interactions, were found.…

The interaction of reading and computational abilities in solving mathematics word problems was investigated with the responses of about 20,000 fourth graders and 20,000 eighth graders to items from the Iowa Tests of Basic Skills. Item responses exhibited different types of interaction, a finding with implications for item-response theory…

This study compared the reading comprehension abilities of learning disabled (LD) students with the performance of both their age-peers and their reading-level peers. Subjects were 16 seventh- and eighth-grade LD students, 16 normal achieving eighth graders, and 16 normal achieving fifth graders. To assess the use of prior knowledge under varying…