In this volume, the editors aim to offer a timely focus on preschool bilingual education in the 21st century by drawing attention to the following trends: (1) the diversity of language models and their hybrid, dynamic and flexible nature; (2) the complexities of children's linguistic backgrounds; (3) children's, parents' and teachers' agencies in interaction; and (4) early bilingual development and education as contextually embedded. Given the complexity of providing a global and comprehensive view of these trends in just one issue, the selection of studies included here seeks to offer...