A Cyber-Physical-Social System (CPSS) is an emerging research trend that focuses on integrating the social dimension into Cyber-Physical System (CPS). The CPSS consists of social, physical, and cyberspaces. There is a lack of influential theories and design approaches to reach a unified structure of a CPSS. Furthermore, the impacts of a CPSS on the sustainability performance of systems and processes are still unexplored. The paper addresses this latter research issue by evaluating case studies on CPSSs discussed in the literature.