Presently the world is undergoing tremendous social, cultural and economic transformation. For sociologists, the challenge is arriving at a sound mapping of this tumultuous world stage. In this book, the contributing authors consider solidarity as a cognitive problem of basic science. They examine how solidarity is produced and reproduced, how it is related to social processes, and how such processes can be formalized and create conditions for productively studying their properties. Mathematical models and representations are presented by the authors as a coherent set of tools for understanding many social phenomena.