Proposes an alternative to transformational grammars, based on the notion that a grammatical system should be open to psycholinguistic interpretation, and disallowing grammatical transformations, dealing instead with the information content of sentence surface structure. (Author/AM)

Presents two analyses of deviant phonological systems. The one based on production evidence alone accounts for (1) differences in surface behavior of a set of phonetic segments with three possible phoneme sources, and (2) obstruent clusters across morpheme boundaries. The "substitution analysis" identifies the child's underlying representations…