This book provides a contemporary approach to the study of bilingualism. Drawing on contributions from leading experts in the field, this book brings together - in a single volume - a selection of the exciting work conducted as part of the programme of the ESRC Centre for Research on Bilingualism in Theory and Practice at Bangor University, Wales. Each chapter has as its main focus an exploration of the relationship between the two languages of a bilingual. Section by section, the authors draw on current findings and methodologies to explore the ways in which their research can address this question from a number of different perspectives.