While the notion of generalization fits prominently into cognitive theories of learning, there is surprisingly little research literature that takes an overview of the issue from a broad multifaceted perspective. This volume remedies this by taking a multidisciplinary perspective on generalization of knowledge from several fields associated with Cognitive Science, including Cognitive Neuroscience, Computer Science, Education, Linguistics, Developmental Science, and Speech, Language and Hearing Sciences. Researchers from each perspective explain how their field defines generalization -- and what practices, representations, processes, and systems in their field support generalization. They also examine when generalization is detrimental or not needed. A principal aim is the identification of general principles about generalization that can be derived from triangulation across different disciplines and approaches. Collectively, the contributors' multidisciplinary approaches to generalization provide new insights into this concept that will, in turn, inform future research into theory and application, including tutoring, assistive technology, and endeavors involving collaboration and distributed cognition.