In linguistics, prescription can refer both to the coification and the enforcement of rules governing how a language is to be used. These rules can cover such topics as standards for spelling and grammar or syntax; or rules for what is deemed socially or politically correct. It includes the mechanisms for establishing and maintaining an interregional language or a standardized spelling system. It can also include declarations of what particular groups consider to be good taste. If these tastes are conservative, prescription may be (or appear to be) resistant to language change. If they are radical, prescription may be productive of neologism. Prescription can also include recommendations for effective language usage.