The book makes a unique contribution to a topical subject in the sub-Saharan Africa, namely the institutionalisation of the first-language-based bilingual education, in conjunction with access to a language of wider communication. Tanzania is one of only a few post-colonial African states that have been committed, since its establishment, to civic bilingualism and biculturality – factors which, in sociolinguistic terms, comprise the basis for a strong bilingual education system. The book is based on policy-making from the data collected at eight Tanzanian schools (four primary and four secondary). The analysis of these data offers an in-depth yielding totally new insights that are of great value for the purpose of future strategy and forward planning in respect of bilingual education for Tanzania. In this book a viable and relevant model for implementing strong bilingual education in the Tanzanian sociolinguistic environment is proposed to guide the policy-makers tasked with language-in-education planning.