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Direct linkFletcher, Jack M.; Francis, David J.; Morris, Robin D.; Lyon, G. Reid – Journal of Clinical Child and Adolescent Psychology, 2005
The reliability and validity of 4 approaches to the assessment of children and adolescents with learning disabilities (LD) are reviewed, including models based on (a) aptitude-achievement discrepancies, (b) low achievement, (c) intra-individual differences, and (d) response to intervention (RTI). We identify serious psychometric problems that…
Descriptors: Educational Diagnosis, Low Achievement, Psychometrics, Adolescents
Fletcher, Jack M.; Francis, David J.; Morris, Robin D.; Lyon, G. Reid – Journal of Clinical Child and Adolescent Psychology, 2005
The reliability and validity of 4 approaches to the assessment of children and adolescents with learning disabilities (LD) are reviewed, including models based on (a) aptitude-achievement discrepancies, (b) low achievement, (c) intra-individual differences, and (d) response to intervention (RTI). We identify serious psychometric problems that…
Descriptors: Educational Diagnosis, Low Achievement, Psychometrics, Adolescents
Fletcher, Jack M.; Francis, David J.; Morris, Robin D.; Lyon, G. Reid – Journal of Clinical Child and Adolescent Psychology, 2005
The reliability and validity of 4 approaches to the assessment of children and adolescents with learning disabilities (LD) are reviewed, including models based on (a) aptitude-achievement discrepancies, (b) low achievement, (c) intra-individual differences, and (d) response to intervention (RTI). We identify serious psychometric problems that…
Descriptors: Educational Diagnosis, Low Achievement, Psychometrics, Adolescents
Peer reviewedLyon, G. Reid – Annals of Dyslexia, 1995
This article presents an operational, inclusionary definition of dyslexia constructed by the Orton Dyslexia Society Research Committee and others. Each clause of the definition is explained in terms of relevant research findings. The definition attempts to identify unique factors of reading disability, independent of its common association with…
Descriptors: Definitions, Dyslexia, Educational Diagnosis, Learning Disabilities
Fletcher, Jack M.; Lyon, G. Reid; Fuchs, Lynn S.; Barnes, Marcia A. – Guilford Publications, 2006
Evidence based and comprehensive, this important work offers a new approach to understanding and intervening with students with learning disabilities. The authors--leading experts in neuropsychology and special education--present a unique model of learning disabilities that integrates the cognitive, neural, genetic, and contextual factors…
Descriptors: Educational Diagnosis, Reading Difficulties, Neuropsychology, Intervention
IQ Is Irrelevant to the Definition of Learning Disabilities: A Position in Search of Logic and Data.
Peer reviewedLyon, G. Reid – Journal of Learning Disabilities, 1989
This response to a paper by Linda Siegel (EC221505) on the relationship between Intelligence Quotient and learning disabilities addresses the differences between classification and identification, limitations in Siegel's conceptualization of intelligence, and the representation of the language and learning domains subsumed within the learning…
Descriptors: Classification, Educational Diagnosis, Elementary Secondary Education, Handicap Identification
