The World’s Schoolmaster, Anrdeas Schleicher of the OECD Pisa, has resorted to tricks from the distraction playbook in order to deflect increasing attention on the conceptual error in their rankings model.

In the six months since OECD Pisa were first alerted to the critical paper by Dr Hugh Morrison of Queen’s University Belfast and six weeks on from the headlines of the Times Educational Supplement the attitude of the headmaster has been to lock himself into his silence silo, covering his ears and chanting inwardly ” la, la, la,la,”