This Handbook offers a comprehensive collection of essays that cover essential features of geographical mobility, from internal migration, to international migration, to urbanization, to the adaptation of migrants in their destinations. Part I of the collection introduces the range of theoretical perspectives offered by several social science disciplines, while also examining the crucial relationship between internal and international migration. Part II takes up methods, ranging from how migration data are best collected to contemporary techniques for analyzing such data. Part III of the handbook contains summaries of present trends across all world regions. Part IV rounds out the volume with several contributions assessing pressing issues in