The need for integration of human interaction scenarios into BPEL processes lead to the formalisation of tasks and human roles. The specifications BPEL4People and WSHumanTask introduce, among other definitions, a dedicated people activity that uses a task performed by a human as well as human roles that describe the relationship of people, processes and tasks. This work presents the architecture of Vienna BPEL for People (VieBOP), a new BPEL4People system that can be coupled with an arbitrary BPEL engine. We will evaluate the standards for BPEL4People and WSHumanTask against goals as derived from the BPEL4People white paper and compare it to our work.

Abstract. Web services have a substantial impact on today's distributed software systems, especially on the way they are designed and composed. Specialization of different services is leading to a multitude of applications ultimately providing complex solutions. The interaction and modeling aspects of Web services is increasingly becoming important. Based on the needs for Web services conversations, process modeling, and composition, a variety of languages and technologies for Web services composition have evolved. This case study is focused on a systematic evaluation of the support for workflow patterns and their BPEL (Business Process Execution Language for Web Services) implementation in Collaxa, a leading BPEL process modeling and enactment engine for Web services processes.

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