The 25 contributions of this volume represent a selection from the more than 120 papers originally presented at the International Conference on "Multilingual Individuals and Multilingual Societies" (MIMS), held in Hamburg (October 2010) and organized by the Collaborative Research Center "Multilingualism" after twelve years of successful research. It presents a panorama of contemporary research in multilingualism covering three fields of investigation: (1) the simultaneous and successive acquisition of more than one language, including language attrition in multilingual settings, (2) historical