ELEMENTS OF EDUCATIONAL PRODUCTIVITY ARE IDENTIFIED WHICH ARE INFLUENCED BY SIZE OF SECONDARY SCHOOLS. PRODUCTIVITY INCLUDES OUTCOMES SUCH AS ACADEMIC PROGRESS AND SOCIAL BEHAVIOR AND EXCLUDES ECONOMIC OUTCOMES SUCH AS GAINS IN INCOME. RESEARCH IN THIS FIRST PHASE WAS DONE WITH THE HIGH SCHOOLS OF IOWA. DATA STORED WITH THE IOWA EDUCATIONAL INFORMATION CENTER AND THE U.S. BUREAU OF THE CENSUS WERE USED. CLASSES OF INDICATORS WERE DEVELOPED AND ANALYZED STATISTICALLY. STEPS WERE THEN TAKEN TO (1) DEFINE SUB-CLASSES OF HOMOGENEOUS INDICATORS, (2) PERFORM PRINCIPAL COMPONENTS ANALYSIS ON EACH SUB-CLASS TO CHECK HOMOGENEITY, REMOVE AMBIGUITY AND COMPUTE COMPONENT SCORES, (3) PERFORM IMAGE ANALYSIS ON THE COMPONENTS WITHIN EACH CLASS OF INDICATORS AND COMPUTE IMAGE FACTOR SCORES, (4) PERFORM REGRESSION ANALYSIS OF IMAGE FACTORS FOR EACH CLASS OF INDICATORS USING PRODUCTIVITY AS THE DEPENDENT VARIABLE, AND (5) INTERPRET SIGNIFICANT INTERACTION REGRESSION COEFFICIENTS. TEN IMAGE FACTORS WERE EXTRACTED, BUT THE SPARSITY OF DATA ON SOCIAL CHARACTERISTICS OF SCHOOL DISTRICTS REDUCED THE VALIDITY OF THE ANALYSIS. A PRINCIPAL CONCLUSION OF THIS PHASE IS THAT DATA DESIGNED AND COLLECTED FOR ADMINISTRATIVE PURPOSES CAN BE AS COSTLY AND TIME CONSUMING TO CONVERT TO RESEARCH USES AS THE SAMPLING OF POPULATIONS AND GATHERING OR ORIGINAL DATA. (BD)