Using a 41-test battery of cognitive-perceptual-motor tests supplemented by standardized tests of intelligence, visual perception, eye hand coordination, linguistics, and non-verbal integration, a group of 200 maladjusted school age children from grades 1, 2, 3, and 5 was compared with a group of problem-free children similar in size, sex distribution, and other relevant characteristics. The findings supported the hypothesis that a significant percentage of maladjusted school children have serious immaturities in cognitive-perceptual-motor functioning which are associated with their behavior maladjustment and learning disorder. Two clearly distinguishable groups were found within each maladjusted grade group: a low dysfunction group of 60% who functioned well and similar to the problem-free children on cognitive motor tasks; and a high dysfunction group of 40% who were extremely low in their performance. This high dysfunction group was considered highly vulnerable to problem behavior and learning disorder, needing maximum attention at school. A major product of the research, a complete test procedure, which was refined for economical use as a screening instrument in schools, clinics, and day care centers, and which provides information useful in remedial and retraining programs, is included. The final report is also in the ERIC system. (Author)