There is need for early group assessment aimed at prevention of learning disorders, specifically reading disorders. An estimated 15% of elementary and secondary school students are reported to be handicapped in the area of reading. Early screening and matching of the learning ability of children with instructional programs holds promise to diminish school learning problems. From the beginning of formalized schooling, efforts have been made to analyze the task to reading. This task analysis has led from a visual or auditory approach to a meaning and code breaking approach. Most recently a model of perceptual characteristics of learners has been developed. A task-learner characteristic model is an attempt to generate a best-fit blend in instruction; that is, the learner and his characteristics are blended in the most appropriate way with the task that he is to learn. Copies of the models developed are appended. (Author/CK)