This report analyzes assumptions and conclusions presented in state reports related to increasing efficient use of college facilities through extended hours of instruction and year-round operation. Data were obtained through questionnaires mailed to every California community college district and through studies on these subjects. One chapter presents a review of the studies and reports of the State Coordinating Council for Higher Education leading to this study, and a review of the literature pertaining to calendars of operation. Another chapter reviews studies by district, aspects of the factors involved in calendar conversion, and computation of gain in enrollment capacity by adopting year-round operation. A third chapter investigates the actual use of facilities, and computes the gain in capacity by extending hours of instruction. The last chapter concludes, in general, that conversion to a year-round operation and/or increasing instructional time will do little to solve the long-term needs for additional capacity of most of the districts. Specific conclusions and recommendations are listed. [Not available in hard copy due to marginal legibility of original document.] (Author/RC)