Situated within the interrelated disciplines of applied sociolinguistics and the sociology of language, this book explores the language use and attitudinal perceptions of a sample of 130 adults who received Gaelic-medium education (GME) at primary school, during the first years of that system’s availability in Scotland. The school is viewed by policymakers as a crucial site for language revitalisation in such diverse contexts as Hawai’i, New Zealand and the Basque Country – as well as throughout the Celtic-speaking world. In Scotland, GME is seen as a key area of language development, regarded by policymakers as a strategic priority for revitalising Gaelic, and maintaining its use by future generations of speakers. Yet theorists have stressed that school-based policy interventions are inadequate for realising this objective in isolation, and that without sufficient support in the home and community, children are unlikely to develop strong identities or supportive ideologies in the language of their classroom instruction. For the first time, this book provides an in-depth assessment of language use, ideologies and attitudes among adults who received an immersion education in a minority language, and considers subsequent prospects for language revitalisation in contemporary society. Based on detailed analyses using mixed methods, the book offers empirically grounded suggestions for individuals and policymakers seeking to revitalise languages internationally.