Some studies have paid attention to the social use of language and to variations in dialect within languages in regard to social class or occupation. Regarding such variations, lexicographer Robert Burchfield notes that their nature "is a matter of perpetual discussion and disagreement" and notes that "most professional linguistic scholars regard it as axiomatic that all varieties of English have a sufficiently large vocabulary for the expression of all the distinctions that are important in the society using it." He contrasts this with the view of the historian John Vincent, who regards such a view as