This report presents the findings of a study done by a college-wide task force at the College of DuPage (Illinois) on academic calendar formats in an effort to determine whether to retain the quarter system or convert to another calendar. A brief introduction gives the background to the issue at DuPage. A section on procedures explains that the Task Force formed three committees to conduct the study: (1) an Other Institutions Committee contacted several other four- and two-year institutions and statewide systems to gather data via telephone interviews; (2) a Literature Search Committee conducted a search of data bank information systems; and (3) a Constituency Needs Committee conducted focus groups; open hearings; and a survey of administrators, classified staff, full- and part-time faculty, and day and evening students. A third section presents the findings of each of the committees that generally supported a recommendation to retain the quarter system as information from literature and other institutions indicated mixed follow-up results in retention, grading patterns, and changes in admission patterns following calendar changes. A concluding section offers suggestions for modifications to the existing quarter system. Extensive appendixes contain data, the survey instrument, and exhibits from the three committees. (JB)