At a briefing on Friday morning, an Education Department official said that over the five years, 521 teachers were rated in the bottom 5 percent for two or more years, and 696 were repeatedly in the top 5 percent.
But citing both the wide margin of error — on average, a teacher’s math score could be 35 percentage points off, or 53 points on the English exam — as well as the limited sample size — some teachers are being judged on as few as 10 students — city education officials said their confidence in the data varied widely from case to case.
Anything you need to quantify can be measured in some way that is superior to not measuring it at all.
Anything can be made measurable in a way that is inferior to not measuring it at all
Given the choice between not measuring and using an ineffectual measurement, management will always chose the ineffectual measurement, as long as it is cheap
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