Conference speakers reviewed and analyzed the current thinking underlying the basic concepts of test norms, reliability, and validity. Roger T. Lennon's paper called for more attention to the development of norming theory and summarized current norming practices and the establishment of a system which would permit comparable norms for tests which were standardized on different samples. Robert L. Thorndike commented on proposals, practices, and procedures for estimating reliability. Anne Anastasi reviewed recent approaches to the study of validity. During the session devoted to test use in medicine, John P. Hubbard described a method used to test the diagnostic competence of interns. E. Lowell Kelly reported on an extensive investigation of predictor and criterion variables of concern to medical schools. Jerome S. Bruner presented the luncheon address on human development. Warren G. Findley discussed current theory and applications in the appraisal of cognitive ability. Non-cognitive aspects of student performance were treated by Samuel Messick, who considered the portential contribution of personality assessment techniques to the prediction of college success. The final speaker was Robert L. Ebel, who spoke on the social consequences of educational testing. (BH)