Developing meaningful educational experiences and assessments in massive open online courses can be a significant challenge for course developers. In this paper, we discuss a variety of strategies that we have used in MOOC development in order to assure that we are giving our students meaningful, rigorous assessment activities. Some strategies discussed in this paper include short answer-style quizzes, drawing by drag-and-drop, self-assessed free-response questions, and the use of fill-in-the-blank derivations.