Computerized assessment of verbal skill.

This paper describes a computerized diagnostic test for the assessment of basic literacy skills in Dutch. Central in this test is a skill labeled word image, referring to the subject's implicit knowledge of orthographic structure. Test norms were obtained in a group of reference subjects. The most notable trend found in the standardization study was that the development of word image performance showed a nonlinear, U-shaped trend. Two case studies are reported. A supplementary validation study, based on test data collected from standard reference groups of normal and poor readers, demonstrated that word image performance is significantly related to between-group differences.