This book presents a life-oriented approach, which is an interdisciplinary methodology proposed for cross-sectoral policy decisions such as urban and transport policies. Recognizing that improving peoples quality of life (QOL) is one of the common goals of urban and transport policies and QOL is closely linked with differing life choices, the life-oriented approach argues that life choices in different domains (e.g., residence, neighborhood, health, education, work, family life, leisure and recreation, finance, and travel behavior) are not independent of one another, and ignorance of and inability to understand interdependent life choices may result in a failure of consensus building for policy decisions. The book provides evidence about behavioral interdependences among life domains based on not only extensive literature reviews, but also empirical analyses by using new survey data covering a broader set of life choices. This work further illustrates inter-behavioral analysis frameworks with respect to various life domains based on case studies in diverse countries, along with a rich set of future research directions. Because this book deals with life choices in a relatively general way, it can serve not only as a reference for research, but also as a textbook for teaching and learning in varied behavior-related disciplines.