This book focuses on non-functional phonologies (NFP): that is, phonological disorders with no known physiological or neurological causes. It is a substantial book, well written and carefully researched, with an applied and pedagogical orientation that will make it invaluable for clinicians and students in speech pathology and child phonology. It is an ambitious and original work; its practical guidance for those assessing child phonology is based on a comprehensive and up-to-date descriptive and theoretical review of phonological systems and their realization in children's speech. It consists of six chapters, each of which introduces general concepts of phonology as well as modern concepts of nonlinear phonology and includes practical material, most notably a set of original worksheets that are geared to assessment or other types of intervention. It also has three appendices: the first reviews commercial tests, the second provides examples of stress patterns in English lexical items, and the third presents conventions of the International Phonetic Alphabet.