The existence of substantive parametric variation in syntax, as characterized in Chomsky 1981, has been questioned in the more recent generative literature, notably in Borer 1984, Fukui 1986, and Chomsky 1993. This article provides converging evidence from child language acquisition and comparative syntax for the existence of a syntactic parameter in the classical sense of Chomsky 1981, with simultaneous effects on syntactic argument structure (e.g., verb-particle constructions) and complex word-formation (root compounding). The implications are first that syntax is indeed subject to points of substantive parametric variation as envisioned in Chomsky 1981, and second that the time course of child language acquisition is a potentially rich source of evidence about the innate constraints on language variation.
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