The article describes new dialect formation in Høyanger, a small industrial town located in the county of Sogn og Fjordane on the west coast of Norway, where an aluminium industry was established in 1916. Four generations of dialect development are studied from a synchronic and a diachronic point of view, based on older real-time data as well as new fieldwork. Qualitative interviews with informants at different ages shed light on linguistic choices made in complex dialect contact situations, particularly at the decisive second stage of koineization. Local and social embeddings are essential for the interpretations of the results because the linguistic changes seem to be dependent on dynamic relations between language and society. The results are interesting as a contribution to recent debate on the role of identity and social factors in new dialect formation. Related to more general processes of linguistic change, the article also discusses further development of the focused dialect.

Koineization – the development of a new, mixed variety following dialect contact – has well-documented outcomes. However, there have been few studies of the phenomenon actually in progress. This article describes the development of a new variety in the English New Town of Milton Keynes, designated in 1967. The article is structured around eight “principles” that relate the process of koineization to its outcomes. Recordings were made of 48 Milton Keynes-born children in three age groups (4, 8, and 12), the principal caregiver of each child, and several elderly locally born residents. Quantitative analysis of ten phonetic variables suggests that substantial but not complete focusing occurs in the child generation. The lack of linguistic continuity in the New Town is demonstrated, and the time scale of koineization there is discussed. Finally, it is shown that demography and the social-network characteristics of individuals are crucial to the outcomes of koineization.