That the use of data in schools is still a matter for debate puzzles me. How can something so useful be in any way controversial? How can there be any doubt that it is a good thing?
The answer, I believe, is in the word itself. We need to talk less of data, and more of insight. Data can mean nothing more than numbers in a folder, gathering dust. Its beauty, or at least its value, is in the eye of the beholder.
At worst, data can be used to confuse instead of clarify. Insight, on the other hand, is surely beyond controversy.