The development and testing of an instrument used to measure the five major societal functions of schooling are described. These functions, as defined by William Spady, include: custody or control over students, course selection, student evaluation and certification, instructional processes, and socialization. The following sequence of events took place: (1) The literature and existing instrumentation were reviewed. (2) The operational manifestations of each function were defined. (3) An initial draft of the instrument was developed and tested in several secondary schools. (4) The instrument was revised according to the data from this initial test, using standard item analysis and reliability procedures. (5) The revised instrument was administered on a pre-post test basis in a second sample of schools. (6) Further data analysis refined the instrument, eliminated items which did not have a high correlation with a particular function, and identified relationships between functions. (7) The instrument was again revised and submitted to the National Institute of Education along with recommendations for further work. First, second, and final test drafts of this instrument as well as suggestions of the consultant review panel are appended. (Author/MV)