On-line administration of tests minimizes labor overhead and enables us to give students immediate feedback and scoring on their answers. It has the drawback, however, that simultaneous test takers must each be at a proctored computer workstation. That requirement diminishes the number of students that can simultaneously take the exam, thereby increasing the number of distinct exams that are needed. The fact that lab sections have a computer per enrollee facilitates the administration of on-line tests in lab. Note that scheduling the lab sections for a given class into the fewest possible time slots minimizes the number of distinct exams that are required. (The same, say 25, questions can be given to each of the concurrent test takers but in multiple random orderings.)