Indigenous-language immersion (ILI) is a form of schooling where all, or nearly all, classroom instruction in every subject area is conducted in an Indigenous language. This dissertation comprises three case study comparisons of neighboring pairs of ILI and English-medium school programs. The first case study examines two elementary schools in the…

The present dissertation brings together research on heritage language acquisition and bilingual education and makes inroads into the limited research on heritage language development in school-aged bilingual children. This study explores how bilingual education, patterns of exposure, and lexical frequency shape adolescent Spanish heritage…

The Latino English Language Learner population continues to rise each year in our schools, currently accounting for over 10% of all K-12 students in the United States (Cheung, 2019). Even with this growth in population, Latinos continue to lag behind other races in academic attainment and advancement in postsecondary success (NCES, 2019). This…

Administrators and teachers are tasked with the opportunity to implement bilingual programs to accommodate the growing population of multilingual learners, or MLs. There is a debate in the field about the most appropriate structure for bilingual programs. Sheltered Instruction (SI) is a way to "shelter" MLs from the anxiety of regular…

Students' instructional needs are identified, and proper interventions and instructional placement are put in place to maximize student-learning potential, but there is a gap in literature regarding the impact of classroom factors on student achievement of English learner (EL) students in diverse elementary schools (Heritage, Walqui, &…

The purpose of this study was to investigate Spanish-speaking multilingual learner (MLL) students' long-term academic outcomes after participation in an early childhood education (ECE) program with English instruction. The study included 359 Spanish-speaking MLLs who qualified for Free and Reduced Lunch from Grade 1 to Grade 6. Participants…

Whether or not we are teachers, all of us must make sense of language. In doing so, we encounter representations of language, implicit or explicit descriptions which shift over time and are always tied to social and political interests. Teachers' work necessarily depends on these descriptions, which are deeply embedded within their…

This study examined the vocabulary development of Spanish-English bilingual adolescents (n=98) from the end of 6th through the end of 7th grade in a dual language setting by looking at the patterns of growth in English and Spanish vocabulary post intervention and adding to the body of research on vocabulary development. Data were analyzed using…

This study examines the use of Spanish as the language of instruction with Spanish dominant EL students in a 9th grade Algebra 1 classroom. The study documents conceptions of mathematical symbols at the start and at the end of the academic year of two groups of students; one receiving primary language instruction and another receiving sheltered…

English language learners (EL) are the fastest growing sub-group of the student population in California, yet ELs also score the lowest on the science section of the California Standardized Tests. In the area of bilingual education, California has dramatically changed its approach to English learners since the passage of Proposition 227 in 1998,…

This study explores the effects of a Two-Way Bilingual Immersion (TWBI) program on language majority and minority students. The fundamental hypothesis was that the process of receiving instruction in two languages (English and Spanish) throughout elementary school (i.e., attendance at a TWBI school) would help the native Spanish-speaking students…