The paper describes the development and use of the Behavior Evaluation Scale (BES), an instrument designed to rate behavior problems for diagnosis, assist in developing individualized education programs (IEPs), document progress resulting from intervention, and collect data for research purposes. The uses of the BES in screening, diagnosis, IEP development and research are considered. Background information is offered on the BES characteristics (including its validity and reliability and procedures for developing local norms) and components (learning problems, interpersonal difficulties, inappropriate behaviors, unhappiness/depression, and physical symptoms/fears). Initial construction and field testing procedures are described, as are standardization procedures and data. Reliability as well as content, criterion-related, and construct validity are reported. Administration and interpretation information is illustrated by a sample data sheet. Uses of three levels of analysis (total score, subscale profile, and item analysis) are portrayed. (CL)