This book contributes to building the research knowledge that language teaching professionals need in developing curriculum for the large population of East Asian heritage students (including Chinese, Japanese, and Korean) in countries like the United States, Canada, and Australia, where speakers of East Asian languages are among the fastest growing populations. Heritage learners are defined as those who initially acquired certain levels of linguistic and cultural competence in a non-dominant language mainly through interaction with foreign-born parents and other family members at home.