The comments are coming in thick and fast on an Education Week story I wrote that looks at some of the early final results of districts' and states' newly revamped teacher-evaluation systems. In general, they found that most teachers are scoring in the top categories.

Now comes the hard part: What does this data mean? Are all teachers really that good? Or are the observation systems generating too many "false positives?" Are the objective measures, which tend to be more evenly spread, not reflecting teachers' good practice? Or, as suggested by recent research, are principals tending to inflate their own teachers' marks?

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