As English-linguist Larry Andrews describes it, descriptive grammar is the linguistic approach that studies what a language is like, as opposed to prescriptive, which declares what a language should be like. In other words, descriptive grammarians focus analysis on how all sorts of people in all sorts of environments, usually in more casual, everyday settings, communicate, while prescriptive grammarians focus on the grammatical rules and structures predetermined by linguistic registers and figures of power for those who are under the control of said authorities to use. An example Andrews uses in his book is fewer than vs less than. A descriptive grammarian would state that both statements are correct, as long as the receiver of the message can understand the meaning behind the statement. A prescriptive grammarian, on the other hand, would analyze the rules and conventions behind the statements made and determine which statement is correct according to those rules. Andrews also believes that although the majority of linguists would be descriptive grammarians, the majority of public school teachers tend to be prescriptive.