TO DETERMINE HOW SECONDARY SCHOOL TEACHERS AND PRINCIPALS PERCEIVED SUPERVISORY STIMULI, A 36-ITEM QUESTIONNAIRE WAS ADMINISTERED IN 15 THREE- AND FOUR-YEAR SECONDARY SCHOOLS IN NEW YORK STATE, REPRESENTING A STRATIFIED RANDOM SAMPLE ACCORDING TO STUDENT POPULATION, GEOGRAPHIC LOCATION, AND STATUS AS A CITY OR VILLAGE SCHOOL DISTRICT. RESPONDENTS INCLUDED FIVE PRINCIPALS AND 165 TEACHERS OF VILLAGE SCHOOLS AND 10 PRINCIPALS AND 531 TEACHERS OF CITY SCHOOLS. THE SUPERVISORY PROGRAM WAS DEFINED AS THE COLLECTIVE BEHAVIOR WHICH THE PRINCIPAL EXHIBITS TO ACHIEVE INSTRUCTIONAL IMPROVEMENT. PERCEPTIONS OF PRINCIPALS AND TEACHERS WERE MEASURED ON AN ASCENDING FIVE-POINT SCALE FOR NINE CATEGORIES OF SUPERVISORY TASKS--CURRICULUM DEVELOPMENT, INSTRUCTIONAL ORGANIZATION, STAFFING, PROVISION OF INSTRUCTIONAL AIDS, ORIENTATION OF NEW INSTRUCTIONAL STAFF, INSERVICE EDUCATION AND PROFESSIONAL GROWTH, COORDINATION OF SPECIAL SERVICES, DEVELOPMENT OF SCHOOL-COMMUNITY RELATIONS, AND EVALUATION. ANALYSIS OF THE DATA SHOWED THAT PRINCIPALS SCORED THEMSELVES SIGNIFICANTLY AND CONSISTENTLY HIGHER THAN DID TEACHERS ON EFFECTIVENESS IN SUPERVISION, THAT OLDER TEACHERS TENDED TO REGARD PRINCIPALS AS MORE EFFECTIVE SUPERVISORS THAN YOUNGER TEACHERS, THAT TEACHERS IN LARGER SCHOOLS AND WITH MORE TRAINING REGARDED PRINCIPALS AS MORE EFFECTIVE SUPERVISORS, AND THAT PRINCIPALS WERE RATED HIGHER BY MALE THAN BY FEMALE TEACHERS AS PROVIDING SUPERVISORY STIMULI. THIS PAPER WAS PRESENTED AT THE ANNUAL MEETING OF THE AMERICAN EDUCATIONAL RESEARCH ASSOCIATION, (CHICAGO, ILLINOIS, FEBRUARY 7-10, 1968). (JK)