Test scores for 31 children with cerebral palsy who had had two or more psychometric examinations within a 3-year period were reviewed. The average shift from one examination to another was 6.5 I.Q. points. It was likely that the changes in test scores due to retesting were largely attributable to the probable errors of the test scores, and that the intelligence quotient may be no less consistent for handicapped children than for an unselected population.