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OF THE DISSERTATION The Development and Validation of a Preschool Screening Instrument for The Identification of Language Impaired and Educable Mentally Handicapped Head Start Children by Samuel Corrado Florida International University, 1992 Miami, Florida Professor Stephen S. Strichart, Major Professor This study developed and validated a preschool screening instrument designed to identify children, enrolled in the Dade County Head Start program, who would be found eligible for placement in a language impaired or educable mentally handicapped program in the Dade County Public Schools (DCPS) system. Previously used commercial screening instruments were demonstrated to have unsatisfactory predictive validity. The new screening instrument was developed by utilizing already existing test items from a developmental skills assessment instrument, the Learning Accomplishment Profile-Diagnostic. These items were selected on the basis of their sensitivity and specificity hit rate scores. The reliability of the new screening instrument was established by using the test-retest and interrater methods. Predictive validity was established by using a double sample technique of 600 Head Start children for each sample and the classification or hit rate method following a comprehensive evaluation process. The new screening instrument was found to be a more accurate predictor of the need for exceptional student education services than the commercial screening instruments. The results showed that predictions could be made with confidence when a preschool screening instrument is developed which clearly defines; a) the population to be screened; b) the population to be identified; c) the criteria to determine who will be referred for comprehensive assessment; and, d) the criteria for determining who is eligible for intervention services. FLORIDA INTERNATIONAL UNIVERSITY Miami, Florida The Development and Validation of a Preschool Screening Instrument for The Identification of Language Impaired and Educable Mentally Handicapped Head Start Children A dissertation, submitted in partial satisfaction of the requirements for the degree of Doctor of Education in Special Education

The development and validation of a preschool screening instrument for the identification of language impaired and educable mentally handicapped Head Start children