In "A Practical Guide to Researching Language" the authors state:

"Freeborn et al. (1993, ch.1) and Crystal (1995:366-7)also discuss 
the question of correctness, and Wray (1996) explores the conflicts 
between prescriptivism and descriptivism that arise when academic 
linguists have to correct the work of their students. Cameron (1995) 
gives a spirited acount of the debate in her chapter 'Dr Syntax and 
Mrs Grundy: the great grammar crusade.' On the other hand, Marenbon 
(1994) suggests that descriptivism and prescriptivism are mutually 
supportive: 'by describing how a certain language is spoken or 
written, the grammarian prescribes usage for those who wish to speak 
or write that language' (p.20)."(p.125)

Eduard 

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