The intent of this commentary is to identify elements of fraction sense and note how the research studies provided in this special issue, in related but somewhat different ways, validate the importance of such understandings. Proficiency with fractions serves as a prerequisite for student success in higher level mathematics, as well as serving as…

The three target articles presented in this special issue converged on an emerging theme: the importance of spatial proportional reasoning. They suggest that the ability to map between symbolic fractions (like 1/5) and nonsymbolic, spatial representations of their sizes or "magnitudes" may be especially important for building robust…

Gersten, Jordan, and Flojo (in this issue) provide the beginnings of an essential bridge between basic research on mathematical disabilities (MD) in young children and the application of this research for the early identification and remediation of these forms of learning disability. As they acknowledge, the field of MD is in the early stages of…

Eight years ago, the editors of this special issue published another special issue focused on the topic of response to intervention (RtI; Vaughn & Fuchs, 2003). At that time, there was considerable interest in the application of an RtI model for providing services to children at risk for learning disabilities. The potential benefits have led to…

Recently, talk of a new type of learning disability (LD)--a foreign language learning disability, or FLLD--has made its way into the LD and foreign language (FL) literature. However, no empirical evidence has been published to support the concept of a "disability" for FL learning by those professionals who use the term. In this article, the author…

In this paper I comment on recent recommendations that students' responsiveness to instruction (RTI) provides a basis for identification of students as learning disabled. I repeat an earlier argument (Gerber & Semmel, 1985) that teachers embedded in schools are naturally variable in their capacity to respond to differences in students' response to…

More than 20 years ago, psychologists first described gifted students with learning disabilities (LD). In the past decade, several sets of identification criteria have been proposed for this population. Many of the suggested assessment practices are unsupported by research in psychoeducational assessment, and some have been directly contradicted…

In the fourth session of the National Research Center on Learning Disabilities Responsiveness-to-Intervention Symposium in 2003, Good, Vellutino, and Torgesen presented papers that addressed the question, "How should unresponsiveness to secondary intervention be operationalized in an RTI approach to LD identification?" In this commentary, I…

Responsiveness to intervention (RTI) is being proposed as an alternative model for making decisions about the presence or absence of specific learning disability. I argue that there are many questions about RTI that remain unanswered, and radical changes in proposed regulations are not warranted at this time. Many fundamental issues related to RTI…