Is he aware that the public examinations were not designed to be tests? They provide certificates to motivate candidates and they give only a rough idea of the levels achieved.
Scientific tests are quite different; they can be repeated with results which correlate. Moreover, criterion-referencing is the basis of national curriculum assessment and this is incompatible with norm-referencing.
Perhaps Dr Tate would like to explain how the voluntary GCSE examinations can become compulsory key stage 4 tests in 1998.
MICHAEL NOLAN 205 Heysham Road Morecambe Lancashire