In dealing with the differences between the school and non-school language of Black children, the author uses a contingency grammar," which considers all speakers of a language to have the identical linguistics competence but includes a level of systematic performance" to account for dialectal and other systematic differences. (FB)

Examines the innate faculties that underlie linguistic competence, especially syntactic competence, and proposes a theory of these faculties which accounts for the complexities of language and the evolution of human language. (AM)