The volume presents a selection of contributions by leading scholars in the field of code-switching. In the past the phenomenon of code-switching was studied within different subfields of linguistics and they all took their own perspectives on code-switching without taking into account findings from other subdisciplines. This book raises a question of a much broader multidisciplinary approach to studying the phenomenon of code-switching; calls for integration of disciplines; and illustrates how frameworks from one subfield can be applied to models in another. The volume includes survey chapters, empirical studies, contributions that use empirical data to test new hypotheses about code-switching, or suggest new approaches and models for the study of code-switching, and chapters that discuss principles and constraints of code-switching, and code-switching vs. transfer.