I thought that Wagner's point about the inconsistency of how we evaluate teaching was very well-put. In my own experience as an educator, I've had different people observe lessons that were, from my perspective, very similar, and gotten wildly different responses. This can make it much more difficult to improve my practices, because I don't know what changes I should make (am I not student-centered enough, or do I need to take more direct control of the classroom?).
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