In general, research has found student evaluations of teaching to be a valid and reliable means to evaluate instruction. However, it is necessarily true that student evaluations reflect the students' perceptions and points-of-view. Therefore, it is important to view course evaluations as just one measure of teaching effectiveness-a set of data that can be used alongside peer evaluation of teaching, instructor self-evaluation, and other measures.
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Quora easily allows you or your students to find questions that have already been posed (that is, by individuals who might or might not have any connection to your course). More than likely, responses to those questions will have already been contributed.