This introduction presents an overview of the key concepts discussed in the subsequent chapters of this book. The book focuses on three actors: individuals, developers, and governments. It describes to learn the state of the world, but we also want to know what produces the state of the world, and what decisions that world produces. The book relates trip-making and activity patterns to demographic and socio-economic conditions, and ties trip generation to variations in land use patterns and metropolitan size. A cooperative is an autonomous association of persons united voluntarily to meet their common economic, social, and cultural needs and aspirations through a jointly owned and democratically controlled enterprise. The behavioral and social sciences are long on theories to model and predict human decision-making. Social learning theory aims to explain human behavior in terms of continuous reciprocal interaction between the characteristics of a person, the behavior of a person, and the environment in which the behavior is performed.