When it comes to secure testing online, even high-tech solutions rely on an old standby: a human proctor. This article asks the question: Is such an approach sustainable in the long run? A student labors over a midterm exam while a vigilant proctor peers over his shoulder, watching for any sign of cheating. It sounds like a tableau from a century ago, but the fact is that human proctors are alive and well, despite meteoric growth in institutions' online offerings. Even the most high tech online testing solutions often rely on a person watching the exam-taking, whether that proctor is on-site at a testing center or monitoring the test via webcam. As the massive open online course phenomenon pushes center stage, it is raising a number of interesting issues about online learning and assessment. Among them, is how huge numbers of students can be tested fairly and efficiently--especially as Massive Open Online Course (MOOC) organizations begin to offer for-credit options.