You must rate teachers. Using explicit external criteria, which as the article indicates, is inherently manipulative and biased, and thus counterproductive. O

You must rate teachers. Using explicit external criteria, which as the article indicates, is inherently manipulative and biased, and thus counterproductive. Or you can use implicit internal criteria -- feedback from the participants who were hired to embody the objective function, to walk the walk. Given the tradeoffs, what better way is there to judge than anonymous peer review?