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In his work Aspects of the Theory of Syntax (1965), Noam Chomsky introduces a hierarchy of levels of adequacy for evaluating grammars (theories of specific languages) and metagrammars (theories of grammars).
These levels constitute a taxonomy of theories (a grammar of a natural language being an example of such a theory) according to validation. This taxonomy might be extended to scientific theories in general, and from there even stretched into the field of the aesthetics of art. This present article's use of the phrase as a terminus technicus should not be confused with its everyday language uses.