Presented is the technical report on development of the Observational Checklists for Referral (OCR), developed to assist teachers of young children in identifying problems that interfere with learning, making appropriate referrals to other professionals, and communicating with parents and professionals. Sections cover summaries of external consultant critiques, formative evaluation reports from users, and statistical analyses of data obtained from two validation studies, as well as recommendations regarding use and further development. Specific topics addressed include content validity, criterion-related validity, construct validity, procedures and comparisons of two validation studies, teacher feedback, and user comments. Appendixes include a pilot test version of the OCR which includes sections on general behavior, health, vision, hearing, speech, and motor abilities; instructions for consultants; consultant reviews; a teacher feedback form; a consultant medical form; and consultant speech form. (Author/SBH)