From March 6 through March 8, 2011, Kyoichi Kijima, Ph.D., Professor of Decision Systems Science, hosted the Fourth Annual Workshop and Open Symposium on Service Systems Science, sponsored by Research Institute of Science and Technology for Society (RISTEX), Japan Science and Technology (JST), at the Tokyo Institute of Technology. The purpose of the workshop and symposium was to bring together leading researchers, educators, and practitioners from North America, Europe, Asia, and Japan to share experiences and exchange expertise related to service science, management, and engineering (SSME). Through participation in the workshop, these leaders clarified important concepts, practices, and challenges in a collaborative venue using a systems science perspective. At the open symposium, distinguished speakers shared their experience from the frontiers of the field and their visions for the future of service systems science. The three days concluded with a panel discussion about state-of-the art approaches to advance the field of service systems science. This paper presents a summary of the workshop proceedings and shares ideas about next steps in the development of the field of service systems science.