This volume contains a selection of papers from the First Workshop on Subject- Oriented Business Process Management (S-BPM ONE). Establishing a multi- and cross-disciplinary interchange of underyling and applied concepts, successful appli- tion studies, and innovative development ideas, the workshop emphasized the pro- tive realization of role- or actor-oriented modeling on the basis of exchanging m- sages when accomplishing tasks. The workshop was organized as a forum for the discussion of foundations, achievements, reflections, and further developments. In this way, its contributions not only addressed the current state of the art, but also the various lines of research and development, either running or planned. The state of the art is reflected in terms of concepts, modeling language, and tool features on the one hand. On the other hand, it is reflected through the discussion of industrial case studies. These indicate the current practice when implementing the subject-oriented BPM paradigm in industrial settings. By challenging conceptual foundations they also allow us to define a common ground for future developments in research and practice. The S-BPM ONE contributions focus on challenges arising from the evolution of service-oriented architectures and the need for more flexible business organizations. The latter require coherent and adaptive representation and processing techniques for business process modeling and execution. Corresponding technologies have to be grounded in theories of computer science, in order to provide an adequate infrastr- ture for thorough BPM including technology-enhanced change management.