This paper introduces Kim’s integrative theory of communication and cross-cultural adaptation. Building on a broad range of existing concepts, models, and research data across disciplines, Kim’s theory addresses two central questions: (a) What is the essential nature of the adaptation process? and (b) why are some strangers more successful than others in the adaptation process? The first question is addressed in the form of a process model. The second question is addressed in the form of a structural model. It is by far the most broad-based theoretical account of cross-cultural adaptation.