Studies of language acqUiSItion have largely ignored processing prin ciples and mechanisms. Not surprisingly, questions concerning the analysis of an informative linguistic input - the potential evidence for grammatical parameter setting - have also been ignored. Especially in linguistic approaches to language acquisition, the role of language processing has not been prominent. With few exceptions (e. g. Goodluck and Tavakolian, 1982; Pinker, 1984) discussions of language perform ance tend to arise only when experimental debris, the artifact of some experiment, needs to be cleared away....