OECD and Pisa tests are damaging education worldwi

In this letter to Dr Andreas Schleicher, director of the OECD's Programme for International Student Assessment, academics from around the world express deep concern about the impact of Pisa tests and call for a halt to the next round of testing.
Read the full article on the Guardian's website:
http://www.theguardian.com/education/2014/may/06/oecd-pisa-tests-damaging-education-academics