<Linguistic description is often contrasted with linguistic prescription, which is found especially in education and in publishing. Prescription seeks to define standard language forms and give advice on effective language use, and can be thought of as the attempt to present the fruits of descriptive research in a learnable form, though it also draws on more subjective aspects of language aesthetics.>
That kind of covers up the correct-incorrect English, good language-poor language view that normally accompanies prescriptivist texts.