Linguistic prescription (or prescriptivism) is the practice of elevating one variety or manner of language use over another. It may imply some forms are incorrect, improper, illogical, lack communicative effect, or are of low aesthetic value. Sometimes informed by linguistic purism, these normative practices may address such linguistics aspects as spelling, grammar, semantics, pronunciation, and syntax. They may also include judgments on socially proper and politically correct language use.