Frontmatter -- Contents -- Contributors -- 1. Investigating Interdependence and Literacy Development in Heritage Language Speakers: Theoretical and Methodological Considerations -- 2. Testing Interdependence in Portuguese Heritage Speakers in Switzerland: The HELASCOT Project -- 3. On the Sociolinguistic Embedding of Portuguese Heritage Language Speakers in Switzerland: Socio-Economic Status and Home Literacy Environment (HELASCOT Project) -- 4. Reading Comprehension Development in Portuguese Heritage Speakers in Switzerland (HELASCOT Project) -- 5. The Deve lopment of Argumentative and Narrative Writing Skills in Portuguese Heritage Speakers in Switzerland (HELASCOT Project) -- 6. Testing the Interdependence of Languages (HELASCOT Project) -- 7. Language Skill Transfer Effects: Moving from Heritage Language to School Language in Kindergarten -- 8. Promoting Multilingualism Through Heritage Language Courses: New Perspectives on the Transfer Effect -- 9. The Development of Russian Heritage Pupils' Writing Profi ciency in Finnish and Russian -- 10. Assessing Heritage Languages and Interdependence: Why and How? -- Index