This book presents research on the learning of foreign languages by children aged 6-12 years old in primary school settings. The collection provides a significant and important contribution to this often overlooked domain and aims to provide research-based evidence that might help to inform and develop pedagogical practice. Topics covered in the chapters include the influence of learner characteristics on word retrieval; explicit second language learning and language awareness; meaning construction; narrative oral development; conversational interaction and how it relates to individual variables; first language use; feedback on written production; intercultural awareness raising and feedback on diagnostic assessment. It will be of interest to undergraduate and graduate students, researchers, teachers and stakeholders who are interested in research on how children learn a second language at primary school.