Drawing on an extensive corpus of original data, this comprehensive linguistic study of Jersey Norman French offers historical and dialectological sketches, an assessment of language planning on Jersey, and an account of language change in progress. Mari Catrin Jones evaluates four different types of linguistic influence found on contemporary Jersey, including the substrate influence of Jersey Norman French on Jersey English. Jones further establishes the relevance of Jersey Norman French to the field of language obsolescence. This book will be of interest to postgraduates and researchers studying varieties of French, and language obsolescence and change.