Assumptions of the model:

1. The web class has grading support so instructor time is 15 min per student. There is also a "maintenance" time of 1 teaching credit a semester to check links and revise the web pages. In other words, the technology makes the student's 3-credit web class a 4-credit class for the instructor.
2. The essay class has 4 essay exams per semester. Each takes 20 minutes to write, but grading takes one-half hour for each student for each test.
3. The multiple choice class has 4 exams, each of which takes 8 hours to write. However, it requires only 1 minute per student to grade each test using machine-graded answer forms.

1. A 3-credit web class takes 8 hours per week, so the maximum enrollment in the web class, with grading support, should be 32 students for a 40-hour work week. Since a 3-credit web class takes 4 credits to run, the professor spends 10.7 hours per week on the class.
2. The maximum enrollment in the 3-credit lecture class should be 20 students for a 40-hour work week or 45 students for a 56-hour work week.
   • Many faculty members work longer than 40 hours and tolerate higher enrollments with essay exams.
   • The rise in hours per week using multiple choice exams is negligible, so very high enrollments require only a marginal increase in faculty time. Multiple choice exams which accurately assess student learning are assumed.
   • The switch from an essay format to a multiple choice format occurs at an enrollment of approximately 45 students.