An analysis is presented of the basic instructional productivity formula, PR = TL x CS, where PR is the index of productivity, TL is the index reflecting teaching load, and CS is the class-size index. Objectives of the analysis are to: extend the basic instructional productivity formula to include recognition of different types of instruction; indicate that the formula may be applied at any level of organizational or temporal aggregation; specify alternate measures of faculty-count data for use on the formula; specify how the course data of the formula may be credit, hour, course, or section measures; suggest other factors and options for consideration in developing the course measures of the formula; and suggest additional extensions and applications of the resulting algebra. (SW)