The midterms were designed to be com pleted by the students in about an hour (which meant that the One to two weeks before each exam, we posted study guides on the course Web site (< <a href="http://www.ncsu.edu/felder-public/">http://www.ncsu.edu/felder-public/</a> cbe205site/guides.html >) that listed the terms and concepts the students might be asked to explain and the types of things they might be asked to do (calculate, formulate, derive, t