This book argues that the field of missiology must adapt Complex Systems Science metaphors, models, and methods in order to remain relevant and valid in the study of twenty-first century realities. To highlight the benefits of the adaptation to a Complex Systems Science-framed approach, a case study of multicultural, multilingual, and multicongregational churches of the Chinese diaspora in North America is used to compare the normative, traditional model of Christian revitalization developed by A.F.C. Wallace with a proposed Complex Systems Science-framed Cusp of Change model. The comparative...