Multi-staged and Multi-viewpoint Service Choreography Modelling

Recent approaches to service-oriented systems engineering start by capturing the interactions between services from the perspective of a global observer, leading to so-called service choreographies. The rationale is that such choreographies allow stakeholders to agree on the overall structure and behaviour of the system prior to developing new services or adapting existing ones. However, existing languages for choreography modelling, such as WS-CDL, are implementation-focused. Also, these proposals treat choreographies as monolithic models, with no support for multiple viewpoints. This paper proposes a multi-staged and multi-viewpoint approach to choreography modelling. For the initial stages, the approach promotes the partitioning of choreography models and the design of role-based views; while for subsequent stages, milestone and scenario models are used as an entry point into detailed interaction models. The paper presents analysis techniques to manage the consistency between viewpoints. The proposal is illustrated using a sales and logistics model.