In 1970, the Illinois Legislature passed bills requiring that elementary school districts institute procedures to identify and treat preschool children who, without such intervention, would not progress satisfactorily in a normal school environment. Efforts in this regard resulted in the screening instrument called Developmental Indicators for the Assessment of Learning (DIAL). Despite initial administrations of the battery and several research efforts, information regarding the reliability and predictive validity of the DIAL was insufficient to promote its general use for preschool screening. This project was funded in an effort to supply the missing data and to address additional questions. The major activities and findings of the project are described in the second section of the report. These concern the content validity of the DIAL as judged by consulting experts in child behavior and development, the predictive validity of the DIAL, the reliability of DIAL administration and scoring procedures, and various recommended modifications of the DIAL. The final section of the report summarizes conclusions and outlines recommendations concerning subsequent steps in the development and use of the DIAL. (RC)