This paper' discusses some basic problema of the implementation of a principles and par rameter based linguistic theory. In the first part it outlines the distinguishing features of such a model, ezemplified by ita best known variety, Government and Binding (G~B) Theory (cf. Chomsky 1981, 1982, 1986a-b). Part 2 discusses some implications of preserving these properties for the design of a parser. Part 3 goes into several relevant issues in linguistic theory ut more detail. 'To appear in Repre~entationa! and Deri~ationat Approache~to Cenerati~e Grammar, Netter, K. ed. Dordrecht: Reidel. 1 (2) a. (John said that) Jill kisaed Jack. b. (John said that) Jack was kiased by Jill.

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