"If you cannot measure it, you cannot improve it. Lord Kelvin A lot of education research is an attempt to measure the effects of teaching (or teachers) on learning (or pupils.) But is this actually possible? ..."
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When numerical values are assigned to teaching we’re very easily are taken in. The effects of teaching and learning are far too complex to be easily understood, but numbers are easily understood: this one’s bigger than that. This leads to pseudo-accuracy and makes us believe there are easy solutions to difficult problems.