For the past two years McKinley High School has been operating on a quarter system in which the September through June school year is divided into four 9-week instructional periods. A formal evaluation was conducted with the intention of getting firsthand information from students and staff on the advantages and disadvantages of the system. A total of 1,337 administrators, teachers, and students responded to the survey. Of this number, 57 percent indicated they liked the quarter system, 27 percent said they did not like the system, and 16 percent were undecided. The document contains the questionnaires; percent distribution and rank order of responses categorized by interest groups, i.e., administrators, counselors, teachers, and students; and write-in comments and suggestions. (Author/MLF)