ABSTRACT
In the view of the generative grammarian the two requirements can only be satisfied if two conditions are met:
(a) if the grammar GENERATES the sentences of a language, i.e. specifies exactly what sequences are sentences in the
Generative grammar - rules and descriptions
language (are "grammatical") and thus, by elimination, those that are not. A grammar satisfying this requirement is said to be OBSERVATIONALLY ADEQUATE, and a theory providing such grammars is said to have WEAK GENERATIVE CAPACITY.
