Constituents, arrays, and trees: two (more) models of grammatical description

Generative syntax was built on the foundations of Immediate Constituent (IC) analysis, and IC methods and heuristics were an important tool in the early days of the generative enterprise. However, developments in the theory entailed a departure from some fundamental IC assumptions: we will argue that structural descriptions in contemporary generative grammar (transformational and non-transformational) define not constituents, but strictly ordered sequences closer to arrays . We therefore define and characterise IC approaches to syntax as opposed to what we will call Array-Based (AB) approaches. IC grammars define distributional generalisations, and proper containment and is-a relations between indexed distributionally defined categories. AB grammars, in contrast, define strictly ordered sequences of categories. In this paper we introduce and define the fundamental properties of IC grammar, and the changes in the generative theory that introduced arrays in phrase structure. We argue that it is crucial to distinguish between IC and AB grammars when evaluating the empirical adequacy of structural descriptions used in current syntactic theorising, as structures in AB and IC grammars represent different relations between expressions and may be better suited for different purposes.