This part deals with the phonological and prosodic organisation of LIS. It is divided into three chapters. The first chapter, Sublexical structure (PHONOLOGY 1), provides an overview of the smallest elements of the language, namely the phonemes. The second chapter, Prosody (PHONOLOGY 2) deals with the main prosodic features of LIS from the syllable to the utterance level. The third chapter, Phonological processes (PHONOLOGY 3), illustrates the main phonological processes occurring both at the lexical and supra-lexical levels.