[Assessment of cognitive abilities of mentally retarded children: applying the Kaufman-Assessment Battery for Children (K-ABC) with children with Down's syndrome].

Standardized tests only give limited information on the intellectual competencies of children with learning difficulties due to problems such as the "floor effect", poor differentiation in the lower range of functioning and flat profiles. Therefore, Reynolds and Clark (1985) suggested supplementing the standard analysis on the basis of chronological age with an alternative form of analysis on the basis of the developmental age level. The present study compares both forms of analysis for a group of 15 children with Down's syndrome tested with the Kaufman-Assessment Battery for Children (K-ABC).