The two-way immersion program Filière Bilingue (FiBi) is a choice-based educational alternative in a public school in Biel/Bienne. It integrates French-speaking, German-speaking and allophone students and strives to promote bilingualism and biliteracy in addition to grade-level academic achievement. This book presents a longitudinal study of oral proficiency development of K-4 learners in French and German (languages of schooling). Data were collected over four years and analyzed by using ...