THE INSTRUCTIONAL RESEARCH, DEVELOPMENT, AND EVALUATION UNIT OF THE DADE COUNTY (FLORIDA) PUBLIC SCHOOLS CONSTRUCTED SEVERAL INSTRUMENTS TO MEASURE CHILDREN'S LANGUAGE DEVELOPMENT. FOUR OF THESE INSTRUMENTS WERE USED BY THE SPECIAL LANGUAGE TEACHER PROJECT IN A STUDY CONDUCTED FROM FEBRUARY TO MAY, 1967 IN DADE COUNTY SCHOOLS. THE OBJECTIVES OF THIS STUDY WERE (1) TO GAIN INFORMATION ON THE VALUE OF THE TESTING DEVICES, AND (2) TO ASCERTAIN THE LANGUAGE DEVELOPMENT PROBLEMS OF FIRST AND SECOND GRADE DISADVANTAGED CHILDREN, SOME OF WHOM ATTENDED PROJECT SCHOOLS AND SOME OF WHOM DID NOT. THE 4 TESTS USED WERE (1) THE AURAL COMPREHENSION TEST, (2) THE ORAL USAGE TEST, (3) AN EVALUATION FORM, AND (4) AN ORAL LANGUAGE RATING FORM. TO TEST THE RELIABILITY OF INSTRUMENTS (3) AND (4), TEACHERS AND SPECIAL JUDGES INDEPENDENTLY EVALUATED THE CHILDREN'S LANGUAGE CHARACTERISTICS. THESE INDEPENDENT EVALUATIONS WERE THEN CORRELATED TO OBTAIN A MEASURE OF THE RELIABILITY OF THE INSTRUMENTS. THE CORRELATIONS WERE FOUND TO BE GENERALLY HIGH. DATA ON THE CHILDREN'S LANGUAGE DEVELOPMENT IN THE PROJECT SCHOOLS VERSUS SUCH DEVELOPMENT IN NONPROJECT SCHOOLS DURING THIS STUDY IS INCOMPLETE. IT WAS FOUND, HOWEVER, THAT THE SCORES OF A MATCHED SAMPLE OF PROJECT AND NONPROJECT CHILDREN ON INSTRUMENT (1) INDICATE NO SIGNIFICANT DIFFERENCE IN GAIN IN LANGUAGE DEVELOPMENT BETWEEN THE 2 GROUPS FROM FEBRUARY TO MAY. (WD)