Chapter in Language Processing and Language Acquisition, edited by Lyn Frazier and Jill De Villiers. Chapter abstract: In order to interpret a sentence involving control, the hearer must identify a referent for the phonetically null element PRO. It is, therefore, of interest to investigate how children acquire this ability. Book description: 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. ...