Characteristics of language production shared by interlanguage and agrammatism, a linguistic symptom of aphasia, are discussed, and it is proposed that the two constitute a reduced system within the language, derived from the language's conceptual system. (MSE)

Discusses variation in interlanguage and suggests two hypotheses to explain such variation as multiple internal representations of a form and processing errors. Suggests that second language learners can initially represent new forms as prototype schemas, and that such non-discrete representations are a third source of variation in interlanguage.…