A computer-based questionnaire was developed to help parents who have not received specialized training to determine whether their young children need further assessment for diagnosis of developmentally at-risk status. The computer automatically determines a starting point for a series of questions according to the child's chronological age. The computer also sets the basal point according to the child's functional level. When the child reaches a certain ceiling point, the computer stops asking questions, calculates the total numbers of "yes" and "no" answers given by the respondent and presents a graphical representation of the child's development. The questionnaire items are written in simple language and use pictures where possible. The validity of the instrument was examined to see how precisely the parent-completed questionnaire assesses children's development as compared to the Child Developmental Inventory, a standardized assessment tool. Results suggest that the parent-completed computer-based questionnaire is a valid tool in screening 15-month-to 36-month-old children's development. (Contains 32 references and 3 tables.) (Author/AEF)