LD or not LD, that was the question: a retrospective analysis of Child Service Demonstration Centers' compliance with the Federal definition of learning disabilities

The Logic of Sample Selection: Who Represents What?

This article focuses on sampling problems related to the use of system-identified subjects in special education research. Differences in school district criteria and procedures for selection of pupils into special education programs for the mildly handicapped have resulted in limited generalizability of research findings across studies. Overlap between samples identified as LD and EMR is particularly noticeable. Suggested approaches to deal with these sampling problems are identified. These include the use of rationally defined subgroups, the statistical procedure of cluster analysis, and marker variables.

The child service demonstration centers: a summary report

The Child Service Demonstration Centers were federally funded programs serving learning disabled students. This report synthesizes information from ten years of operation of these centers, which constituted the federal government's first major effort to meet the educational needs of the learning disabled. Particular emphasis is placed on the areas of diagnostics, training, research, replication, student characteristics, and intervention models.