International labour migration can be characterized in three ways — as human aspiration, tradition, and necessity. For some people, working overseas is a dream. For others, international labour mobility is a tradition. For a great number of people however, international labour migration is an economic necessity. It is the only viable solution to realize their basic human right to a decent life. GMS worker movements to Thailand typify all three characterizations of international labour mobility. While this book focuses on the economic dimensions of international labour emigration, principally from Cambodia, Laos and Vietnam to Thailand, it recognizes at the very outset the equal standing of non-economic motivations for migration.