Group Dynamic Assessment: Reliability and Validity of a Cognitive Assessment Procedure With Adolescents with Developmental Disabilities

In this study the authors investigated the reliability and validity of a group dynamic assessment procedure applied with adolescents with significant cognitive delays and multiple handicapping conditions. The authors addressed the question of how responsive these students are to group mediated intervention using an instrument that measures cognitive processes. The test used was a modification of selected subtests from the Das/Naglieri Cognitive Assessment System (CAS). From the results they documented test-retest reliability and concurrent validity with classroom achievement. The performance of 26 adolescents who participated in a group dynamic assessment procedure was compared to the performance of 22 adolescents who did not participate in the procedure. The group participating in the dynamic assessment procedures showed significant gains in posttest scores. Gains were maintained six months following the intervention.

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