Responds to Birdsong's analysis of the authors' positions and data on asymmetries in SLA. The writers address the conceptual disagreements, theoretical positions, "indeterminacy" problem, and disagreements over evidence. The conclusion addresses the role of subjects' ability to detect ungrammatical sentences within the broader context of SLA…

Addresses the argument that access to Universal Grammar in second-language acquisition implies an asymmetrical knowledge of ungrammaticality. The author attempts to prove that the asymmetry position is conceptually defective and that the evidence for it is inconclusive, inappropriate, and contradicted by other data. (12 references) (Author/CK)

Addresses a number of issues that have to do with nature of mental representation of an interlanguage grammar. Major focus is on necessity of positing some sort of hierarchical constituent structure to account for what second-language learners do in their phonology. The purpose is to show the utility of invoking a theory of abstract phonological…