<p>Weird. I just finished a discrete mathematics class that, according to the syllabus, supposedly has a similar policy on its midterms (which are all take-home): it says you get your score and the teacher recommends areas for brushing up and for further reading, but you may not see which problems you missed. Except that the teacher returned pages to us that showed which problems we missed and exactly why we missed them. This thread reminded me of that “rule”.</p>
<p>Anyway, not only is it pragmatically useful to return an annotated exam to the student, but it is good in principle. The principle is transparency. [url=<a href=“http://en.wikipedia.org/wiki/Security_through_obscurity]Security”>Security through obscurity - Wikipedia]Security</a> through obscurity<a href=“or%20plain%20%5Burl=http://en.wikipedia.org/wiki/Obscurantism]obscurantism[/url]”>/url</a> merely keeps a small part of society trapped within a remnant of the dark ages.</p>