Originally published in 1975, this volume examines conceptual and theoretical aspects of the study of internal migration, both in chapters dealing specifically with theory and data and in case studies. The book discusses the question of who migrates, and why and what are the patterns of flow and direction of movement. The consequences of migration are analysed. Migration is one of the most difficult components of population change to conceptualize and measure and this book considers a wide range of aspects of migration and the problems connected with it.