Evaluation
Evaluation is a topic with a lot of contention. Are standardized tests effective gauges of student learning, or do they in fact inhibit learning and just promote rote memorization. The debates I've had with fellow students (and not just in education) and in classes have all had some very salient points, the strongest of which is that people learn in different ways, and though some may be stifled by the standard test, other flourish in it's format. That is something I never really considered before, and has really opened my eyes to the nature of evaluation and how there are so many more approaches than the way I was shown during my school days.