This collection of papers on functional syntax shows the development of a specific stream of functional linguistics initiated by Susumu Kuno of Harvard University. Inspired by Prague School linguists such as Jan Firbas and Vilém Mathesius, Kuno developed a more comprehensive and theory-oriented approach and linked it with the American formalist approach of generative grammar. His approach is thus a unique combination of functionalism and formalism that constantly urges the promotion of interactions between these two major trends in linguistics. The papers in this collection coherently deal with functional aspects of linguistics from a wide variety of perspectives such as theoretical, applicational, experimental and diachronic aspects, incorporating the functional concept advocated by Kuno.