The volume offers both literature reviews and new findings across disciplines from neuropsychology to child development and from linguistics to cognitive psychology. With a focus on evidence-based practice, contributors consider recent investigations into bilingualism and bilingual programming in different educational contexts and in different countries that may have different models of using spoken and signed languages as well as different cultural expectations. The 18 chapters establish shared understandings of what are meant by "bilingualism," "bilingual education," and "co-enrollment programming," examine their foundations and outcomes, and chart directions for future research in this multidisciplinary area. Chapters are divided into three sections: Linguistic, Cognitive, and Social Foundations; Education and Bilingual Education; and Co-Enrollment Settings. Chapters in each section pay particular attention to causal and outcome factors related to the acquisition and use of these two languages by deaf learners of different ages. The impact of bilingualism and bilingual deaf education in these domains is considered through quantitative and qualitative investigations, bringing into focus not only common educational, psychological, and linguistic variables, but also expectations and reactions of the stakeholders in bilingual programming: parents, teachers, schools, and the deaf and hearing students themselves.