Magnitude understanding is critical for students to develop a deep understanding of fractions and more advanced mathematics curriculum. The research reports in this special issue underscore magnitude understanding for fractions and emphasize number lines as both an assessment and an instructional tool. In this commentary, we discuss how number…

The goal of this randomized controlled trial (RCT) was to evaluate the effectiveness of a small-group intervention in fractions for fifth-graders who are performing below grade level in mathematics. The impact of the fractions intervention was assessed on fifth-grade at-risk students' understanding of foundational fractions concepts and procedural…

The purpose of this efficacy study was to examine the impact of the Teacher Study Group (TSG) professional development program in vocabulary, on teacher knowledge, observed teaching practice, and student vocabulary achievement, when implemented with first grade teachers in Title 1 schools. This multi-site cluster randomized trial was implemented…

The purpose of this replication study was to examine the impact of the Teacher Study Group (TSG) professional development in vocabulary on first-grade teachers' knowledge of vocabulary instruction and observed teaching practice, and on students' vocabulary knowledge. Sixty-two schools from 16 districts in four states were randomly assigned to…

Replication studies are extremely rare in education. This randomized controlled trial (RCT) is a scale-up replication of Fuchs et al., which in a sample of 139 found a statistically significant positive impact for Number Rockets, a small-group intervention for at-risk first graders that focused on building understanding of number operations. The…

The main purposes of this study were to test the effects of teaching at-risk 4th graders to provide explanations for their mathematics work and examine whether those effects occur by compensating for limitations in cognitive processes. We randomly assigned 212 children to 3 conditions: a control group and 2 variants of a multi-component fraction…

The purpose of this study was to use meta-analysis to synthesize findings from randomized control trials and quasi-experimental research on instructional approaches that enhance the mathematics proficiency of students with learning disabilities. A search of the literature from January 1971 to August 2007 resulted in a total of 42 interventions (41…

Randomized field trials were used to examine the impact of the Teacher Study Group, a professional development model, on first grade teachers' reading comprehension and vocabulary instruction, their knowledge of these areas, and on the corollary comprehension and vocabulary achievement of their students. The multi-site study was conducted during…

This study explored beginning special education teacher quality and the role that knowledge and skill for teaching reading plays in defining quality. The authors examined the relationship between beginning teachers' knowledge for teaching reading and their classroom practices during reading instruction and, further, relationships between classroom…

The purpose of this meta-analysis was to synthesize findings from 42 interventions (randomized control trials and quasi-experimental studies) on instructional approaches that enhance the mathematics proficiency of students with learning disabilities. We examined the impact of four categories of instructional components: (a) approaches to…

Use of two direction-setting activities (the basal approach to develop student motivation and the advance organizer approach based on the text outline) to improve content area text comprehension with 24 learning disabled high school students was compared. Results indicated that the advance organizer group significantly outperformed the basal…

Examined the teaching of two Latina/o elementary school teachers and identified issues with the potential for improving the literacy instruction of Latina/o students. Findings indicate that infusion results in a balanced approach to literacy learning, that more extensive reform increases teacher rapport with students, and that teachers' identities…

Two studies evaluated long term effects of the Direct Instruction Follow Through Model with 624 fifth and sixth graders and about 500 high school and older students who had received Follow Through instruction. Achievement and college acceptance results consistently favored the Follow Through groups over control groups with strongest effects in…

Fifteen rural elementary school teachers in classrooms with high proportions of limited-English-speaking students completed self-reporting instruments and their supervisors evaluated their effectiveness. Those teachers with the most effective strategies for low-achieving students reported lower toleration of maladaptive behavior and some active…

Seven secondary teachers of 57 students with learning disabilities used a videodisc program to teach fractions. Teacher and student reactions were very positive, almost two-thirds of the students reached or exceeded criterion performance, and teaching styles of participating teachers subsequently became more interactive. (JDD)