TESTING MATERIALS IN BOTH SPANISH AND ENGLISH LANGUAGE EDITIONS WERE REVISED AND NEW MATERIALS CREATED IN THIS PROJECT. THE NEW SERIES OF TESTS INCLUDED ADMINISTRATION, AND ITEM ANALYSIS OF THE COOPERATIVE INTER-AMERICAN TESTS. DATA FOR THE ENGLISH EDITIONS WERE GATHERED FROM SUBJECTS DRAWN FROM AMERICAN SCHOOLS, AND DATA FOR THE SPANISH EDITIONS FROM SUBJECTS DRAWN FROM PUERTO RICAN SCHOOLS. THESE SAMPLES PROVIDE ITEM ANALYSIS, INTERPRETIVE, AND EVALUATIVE DATA. THE FINAL FORM OF THE TESTS WAS ADMINISTERED FOR DATA ON THE EQUIVALENCE OF THE NEW FORMS AND OTHER SCORES. CORRELATIONS AND THE EQUIPERCENTILE METHODS WERE USED TO EQUATE THE TESTS. TENTATIVE NORMS WERE PREPARED FROM THE RESULTS OF TESTING VARIOUS GROUPS. THE CONCLUSIONS INDICATED THAT A NEW SERIES OF INTER-AMERICAN TESTS OF GENERAL ABILITY AND TESTS OF READING WERE SUCCESSFULLY DEVELOPED. (RS)