Process approaches to organization studies focus on flow, activities, and evolution, understanding organizations and organizing as processes in the making. They stand in contrast to positivist approaches that see organizations and phenomena as fixed, static, and measurable. Process approaches draw on a range of ideas and philosophies. The Handbook examines 34 philosophers and social theorists, both those commonly linked to process thinking, such as Whitehead, Bergson and James, and those that are not as often addressed from a process perspective such as Dilthey and Tarde. Each chapter addresses the background and context of this thinker, their work (with a focus on the processual elements), and the potential contribution to organization and management research. For students and scholars in the field of Organization Studies this book is an entry point into the work of philosophical thinkers and social theorists for whom the world is far from being a solid place.