Research into the complex phenomenon of multilingualism is rapidly increasing. This book looks at multilingualism through its interfaces with language policies, language attitudes and issues of language awareness and identity. The aim is to examine the dynamic processes that lead or hinder the development of such phenomena. One of the scopes of the volume is to represent the complexity of the multilingual speaker by shedding light on different multilingual settings in the world. The chapters of this volume tackle the topic from a sociolinguistic perspective by showing how multilingualism is dynamically constructed. They provide empirical research on language learning in different multilingual environments in the world as well as practical suggestions for the investigation of multilingualism and the improvement of its education.