The purpose of this edited volume is to study the structure of the inflectional field and the left peripheral field of clauses, often described as the systems of IP (Inflection Phrase, a syntactic category used to describe clauses without complement clauses) and CP (Complementizer Phrase, a word of phrase marking a complement clause). With contributions by a select group of syntacticians, this text will be useful to scholars of Italian and Romance languages, and of substantial value to all linguists interested in contemporary research in generative grammar.