I have found Susan Wolcott's teaching materials, which are informed by research by K.S. Kitchener and P. M. King, to be the most helpful in addressing student accusations of bias. I had long been puzzled by why my colleagues in philosophy are so often accused of bias when, in my own observation of their teaching, they take care to keep their own views of a philosophical topic hidden from students. Indeed, they spend a great deal of time playing devil's advocate and championing the philosophical position that is getting the least airtime in class discussion, readily switching sides if another perspective begins to be neglected. Wolcott's developmental analysis, which explains how students arrive at college as "confused fact finders" and often get stuck in learning critical thinking skills at the "biased jumper" stage, helps me to understand how students attribute bias to professors when the students lack skills to maneuver around arguments. The most helpful part of Wolcott's analysis is her suggestion that, if one gives students an assignment that is more than one level above their current abilities in critical thinking, they will completely ignore the assignment task. This failing is particularly visible when students are asked to compare strengths/weaknesses in two arguments but instead write essays in which they juxtrapose two arguments and ignore the task of forging comparisons. In Wolcott's workbooks (available by request on her website), she describes assignments that are specifically designed to help students build a scaffolding for critical thinking so that, over four years, they can actually leave the "biased jumper" stage and move on to more advanced levels of critical thinking. One need not be a slavish adherent to the developmental theory behind Wolcott's work to find her practical suggestions extremely helpful in the classroom. Her chart on stages of critical thinking is the first link below; her website is the second link.
http://www.wolcottlynch.com/Do...
http://www.wolcottlynch.com/Ed...