I have TA&#x27;ed. Asking for questions in public doesn&#x27;t help much. Students rarely like to admit they don&#x27;t know something.<p>I was thinking more of when you look at their assignments. There are often multiple ways to approach a problem, and the route chosen can reveal something about one&#x27;s level of comfort.<p>It doesn&#x27;t help that university TAs get almost no training in how to be a TA. At least, I didn&#x27;t.