Part 1. Lessons from Accumulated Experience in Bilingual and Multilingual Education. Bilingual and Multilingual Education: An Overview of the Field -- Insights into Bilingual Education from Research on Immersion Programs in Canada -- Bilingual Education in Colombia: The Teaching and Learning of Languages and Academic Content Area Knowledge -- Perspectives and Lessons from the Challenge of CLIL Experiences. Part 2. Issues in Language Use in Classrooms at the Elementary, Secondary and Tertiary Levels. From Bilingualism to Multilingualism: Basque, Spanish and English in Higher Education -- 100 Bilingual Lessons: Distributing Two Languages in Classrooms -- Native Language Influence in Teaching Subject Matter Content through English in Spanish Tertiary Education -- From Diglossia to Transglossia: Bilingual and Multilingual Classrooms in the 21st Century. Part 3. Participant Perspectives on Bilingual Education Experiences: Students, Language Assistants, Student-teachers and Teacher-educators. The Students' Views on Their Experience in a Spanish-English Bilingual Education Program in Spain -- The Use of Native Assistants as Language and Cultural Resources in Andalusia's Bilingual Schools -- Student-teachers and Teacher-educators Experience New Roles in Pre-service Bilingual Teacher Education in Brazil -- Potential Drawbacks and Actual Benefits of CLIL Initiatives in Public Secondary Schools. Part 4. The Language Needs of Bilingual and Multilingual Students in Monolingual Schools. International School Students: Developing Their Bilingual Potential -- Heritage Spanish Speakers in School Settings: Are Their Needs Being Met?