We find that the reform significantly and systematically reduces school effectiveness. We find systematic, significant and robust evidence that abolishing school league tables markedly reduced school effectiveness in Wales. The impact is sizeable: a fall of 1.92 GCSE grades per student per year.
Moreover, the impact was worst on the lowest performing schools with the poorest and lowest ability ones most impacted. It was probably compounded by the absence of academies and the National Challenge. This is the strongest evidence yet of the value of performance tables and published data. As Professor David Reynolds says, the Welsh Assembly should consider their reintroduction.
And do so without delay.