Although science has received much attention as a political and educational initiative, students with learning disabilities (LD) perform significantly lower than their nondisabled peers. This meta-analysis evaluates the effectiveness of instructional strategies in science for students with LD. Twelve studies were examined, summarized, and grouped according to the type of strategy implemented. Effect sizes (ES) were calculated for each study. Across all studies, a mean ES of .78 was obtained, indicating a moderate positive effect on students with LD science achievement. Findings also align with past reviews of inquiry-based instruction for students with special needs, indicating that students with LD need structure within an inquiry science approach in order to be successful. Additionally, results suggest that mnemonic instruction is highly effective at increasing learning disabled students' acquisition and retention of science facts.
As a growing number of students with learning disabilities (LD) receive science instruction in general education settings, students with LD continue to perform significantly lower than their non-disabled peers. The shift from textbook-driven instruction to inquiry-based approaches to science learning supports students who struggle with reading. However, research continues to show that for students to fully access the science curriculum, it is critical to address effective ways to increase reading comprehension of expository science text. This meta-analysis identified 20 studies from 12 articles that evaluated the efficacy of such interventions. Effect sizes were calculated for each study. Across all studies, a mean effect size (ES) of 0.98 was obtained. Findings align with past research on reading comprehension of expository text indicating that students with LD benefit from explicit vocabulary instruction (ES = 1.25) and the use of multicomponent interventions (ES = 0.64) when reading science-related material.
This review examined classroom science instruction for students with emotional and behavioral disorders (EBD). A total of 11 group and single-subject studies were analyzed. Across all group studies, a conservatively calculated mean effect size of .471 was obtained indicating the interventions as a whole had at least a small to moderate impact on students' with EBD achievement. Findings were further analyzed by student characteristics, intervention type, dependent measures utilized, and study variables. A significant result of these subanalyses indicates that while additional research is needed, students with EBD may benefit from inquiry approaches provided the method implemented includes enough structure to ensure student engagement. Results also suggest that mnemonic instruction is highly effective at increasing students' with EBD knowledge and retention of science facts.
We investigated the effectiveness of using constant time delay (CTD) with young adults with intellectual disability on their vocabulary acquisition and retention, as well as expository reading comprehension. Four learners, ages 19 to 21 years, from a postsecondary education program for individuals with disabilities participated in the study. During the intervention, instructors used CTD to teach unknown vocabulary embedded in expository texts. In the context of an alternating treatments design, we found that CTD resulted in greater acquisition and retention of the vocabulary knowledge than the control condition. However, the effects of the vocabulary instruction on comprehension of the expository texts were less clear. Implications for practice are provided.
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