At the outset, the goal of generative grammar was the explication of an intuitive concept grammaticality (Chomsky 1957:13). But psychological goals have become primary, referred to as “linguistic competence”, “language faculty”, or, more recently, “I-language”. Kac argues for the validity of the earlier goal of grammaticality and for a specific view of the relationship between the abstract, nonpsychological study of grammar and the investigation of the language faculty.