The purpose of this set of analyses, conducted on a randomized control trial examining the effects of a fourth-grade fraction intervention, was to assess the initial academic deficit severity hypothesis. With this hypothesis, at-risk students with more severe initial academic deficits are expected to profit less from intervention than do students…

Across multiple schools and sites, the impact of grade-at-intervention was evaluated for children at risk or meeting criteria for reading disabilities. A multiple-component reading intervention with demonstrated efficacy was offered to small groups of children in 1st, 2nd, or 3rd grade. In a quasi-experimental design, 172 children received the…

The later effects of the Direct Instruction Follow Through program were assessed in five diverse sites in the United States. Low income fifth and sixth graders who had completed the full 3 years of this first through third-grade program were tested on the Metropolitan Achievement Test (MAT), Intermediate Level, and the Wide Range Achievement Test…