Widely impugned by an uninformed public – and even by many of those who practice it – with such derogatory terms as “Spanglish” or “Chinglish,” or “Pocho” in Spanish, codeswitching (CS) has emerged from marginal obscurity to become a major topic of interest among linguists of a wide variety of persuasions in the past 30 years. Weinreich (1953) famously denied that a switch between languages within a sentence was possible; the MLA bibliography now lists 900 titles on the subject, half of which have appeared since 1995. The present volume – the third edited by the indefatigable Rodolfo Jacobson, a pioneer in the field since the 1970s – reflects both this growth and the increasing breadth of interest that has occurred along with increasing attention to bilingualism generally in its many aspects and implications.