RateMyProfessors.com is a free website where students can evaluate and post comments about courses needs no introduction to most instructors. The problems with the site are equally well known. There’s no guarantee that the students who select to evaluate and post the comments are a representative sample—and no guarantee that the assessments themselves are representative. In fact, in the Kindred and Mohammed (reference below) analysis of evaluation for 626 professors, 41.5 percent had only one rating listed.