In this talk, I’ll share (1) research on the benefits of frequent testing and “second-chance testing” (optional exam re-takes) on increased student learning and decreased test anxiety, (2) research on patterns of cheating on unproctored online assessments, and (3) how we’ve reduced the instructor workload at Illinois to implement frequent testing through our Computer-Based Testing Facility (CBTF).  The CBTF is a collection of proctored computer labs that, in conjunction with the PrairieLearn open-source question-asking platform, enable our faculty to run sophisticated exams with almost no recurring effort even in the largest classrooms.  For example, our CS 1 course for majors (run by a single faculty member) ran weekly exams for 1,150 students.  Key enabling ideas for the CBTF include: (1) sophisticated auto-grading questions, (2) question generators, (3) asynchronous exams, and (4) dedicated testing space and proctors.  The CBTF has been running for over 10 years and proctored over 100,000 exams last semester.