This book looks at the movements of immigrants and refugees and the challenges they face as they cross cultural boundaries and strive to build a new life in an unfamiliar place. It focuses on the psychological dynamic underpinning their adaptation process, how their internal conditions change over time, the role of their ethnic and personal backgrounds and of the conditions of the host environment affecting the process. Addressing these and related issues, the author presents a comprehensive theory, or a `big picture', of the cross cultural adaptation phenomenon.