<p>John, you can additionally consider requiring your grad students to contribute to Wikipedia. If you see that their edits have withstood the criticism and additional edits of the community at large, that's a good sign that your students have mastered the material. (I do list the Wikipedia articles that I contributed to on my <a href="http://web.missouri.edu/~kolenikovs/Stas-Kolenikov-CV-stat-June2011.pdf" rel="nofollow">CV</a>, although I don't know of anybody else who does that.)</p>
