This article addresses the nature of dyslexia and best practices for identification and treatment within the context of multitier systems of support (MTSS). We initially review proposed definitions of dyslexia to identify key commonalities and differences in proposed attributes. We then review empirical evidence for proposed definitional…

Response to intervention (RTI) has been promoted for nearly 20 years as a valid supplement to or alternative method of learning disability (LD) identification. Nevertheless, important unresolved questions remain about its role in disability identification. We had two purposes when conducting this study of 229 economically and racially diverse poor…

Results from a controlled evaluation of remedial reading interventions are reported: 279 young disabled readers were randomly assigned to a program according to a 2 x 2 x 2 factorial design (IQ, socioeconomic status [SES], and race). The effectiveness of two multiple-component intervention programs for children with reading disabilities (PHAB +…

The purpose of this study was to examine the construct and predictive validity of a dynamic assessment (DA) of decoding learning. Students (N = 318) were assessed in the fall of first grade on an array of instruments that were given in hopes of forecasting responsiveness to reading instruction. These instruments included DA as well as…

Response-to-intervention (RTI) approaches to disability identification are meant to put an end to the so-called wait-to-fail requirement associated with IQ discrepancy. However, in an unfortunate irony, there is a group of children who wait to fail in RTI frameworks. That is, they must fail both general classroom instruction (Tier 1) and…

Examination of 42 cases of children with Tourette Syndrome with intelligence quotients (IQs) above 70 found that mean IQs were higher than mean math, spelling, reading, and reading comprehension scores. Using a 1.5 standard deviation discrepancy, 51 percent met criteria for learning disability in at least one academic area; 21 percent had a…

E. Burns' (1984) attempt to explain the below average mean IQ scores reported for samples of learning dsabled (LD) students through the use of the bivariate normal probability distribution was examined. Alternative explanations which focus on issues related to the referral, identification, and placement of children are presented.(Author)

The author argues against the accepted symptom of learning disabilities--a discrepancy between measured intelligence and measured educational achievement scores; and demonstrates that it is feasible to produce a quantitative definition of educational underachievement, and therefore to identify learning disabled students. (SBH)

This response argues that Linda Siegel's paper (EC221505) confuses measures of intelligence with predicted achievement, calls for doing away with the construct of learning disabilities rather than the discrepancy definition model, and overlooks the need to determine which students qualify for special educational services for treatment of learning…

Intake placement data were collected from the files of 1,966 students labeled and served as learning disabled in Child Service Demonstration Centers (CSDC) in 22 states. There appeared to be a lack of consistency in the characteristics of students labeled learning disabled. (Author)

This critique of a paper by Linda Siegel (EC221505) challenges Siegel's assumptions on the relationship of Intelligence Quotient to learning disabilities as being unacceptable and non-literature-based, and points out that discussion of Intelligence Quotient cutoffs may be moot given that 49 states employ no cutoff for learning disabilities. (JDD)

A study investigated whether higher prevalence of reading disabilities among boys is related to gender bias in the prediction of reading from IQ. Data from 1,139 New Zealand children (collected during ages 5-13) indicate a significant intercept bias. Boys' predicted reading scores were systematically overestimated, thereby inflating IQ-reading…

This commentary supports Linda Siegel's challenge to the learning disabilities field (in EC221505) to produce data indicating that dyslexic readers differ from other poor readers in their cognitive processing, educational prognosis, and response to treatment. The commentary also points out that the existence of Matthew effects reinforces Siegel's…

This study examined differences between Wechsler Intelligence Scale for Children-Third Edition (WISC-III) and Wechsler Intelligence Scale for Children-Revised (WISC-R) scores for 40 elementary students with learning disabilities. WISC-III Full Scale, Verbal, and Performance scores were lower than comparable WISC-R scores by one-third to one-half a…