The article looks at the concept of discrepancy between ability and achievement in conceptualizations of learning disabilities. Comparison of ability and achievement scores found generally small average discrepancies, though some wide ranges were evident. Implications of the findings for current and future use of discrepancies as estimators of…

This article examines the problem of definition in learning disabilities. It discusses the failure of conceptual definitions to provide a clear idea of what learning disabilities are, examines the true nature of available definitions as stipulative definitions, and notes the difficulty in conceptualizing and implementing operational definitions.…

The National Joint Committee for Learning Disabilities' definition of learning disabilities is presented, followed by a discussion of parameters to be considered in operationalizing the definition. Major definitional issues are then explored, including using testable and meaningful constructs, linking definitions to neuropsychological evidence,…

A survey of 51 state departments of education focused on learning disabilities definitions, identification criteria, and operationalization procedures. Results showed the continued impact of the 1977 federal definition and criteria. Findings are compared with those from a 1985 survey and discussed in terms of trends, prereferral interventions,…

Two key concepts in diagnosing learning disabilities ("severe discrepancy" and "process dysfunction") are reviewed, and their relationship to the habilitation of learning is discussed. Guidelines are given for calculating a severe discrepancy, and the evaluation of processing skills is discussed. Strength models of remediation…