progressively developed. Building on the theory of principles and parameters and, in particular, on principles of economy of derivation and representation, the minimalist framework takes Universal Grammar as providing a unique computational system, with derivations driven by morphological properties, to which the syntactic variation of languages is also restricted. Within this theoretical framework, linguistic expressions are generated by optimally efficient derivations that must satisfy the conditions that hold on interface levels, the only levels of linguistic representation. The interface levels provide instructions to two types of performance systems, articulatory-perceptual and conceptual-intentional. All syntactic conditions, then, express properties of these interface levels, reflecting the interpretive requirements of language and keeping to very restricted conceptual resources.The EssaysPrinciples and Parameters TheorySome Notes on Economy of Derivation and RepresentationA Minimalist Program for Linguistic TheoryCategories and Transformations in a Minimalist Framework
