This document discusses fluency, intelligibility, and spoken language. It covers three types of fluency - cognitive fluency, perceived fluency, and utterance fluency. It discusses Levelt's model of speech production and how cognitive fluency fits into this model. It also discusses the peculiarities of spoken language compared to written language, including how spoken language is more "non-sentence-based", "freestanding", and "co-constructed". The document examines the concept of "conversational grammar" and challenges of analyzing spoken language using a metalanguage inherited from writing. It covers using "chunks" and the "idiom principle" in analyzing spoken language and implications for teaching spoken grammar.