A software architecture has to enable the non-functional properties, such as flexibility, scalability, or security, because they constitute the decisive factors for its design. Unfortunately, the methodical support for the implementation of non-functional requirements into software architectures is still weak; solutions are not generally established. Recently, there are only few approaches that actually deal with non-functional requirements during design; even fewer take advantage of traceability, which supports a mapping of requirements to solutions through the development process. Therefore, in this chapter the new architectural design method TraGoSoMa is presented, which supports these issues. The method uses a so-called Goal Solution Scheme, which guides the design activities, supports conflict resolution, decision-making, and the classification of solutions. For illustration purposes the chapter uses a case study from a reengineering project for a Manufacturing Execution System (MES) that is restructured according to the SOA principles and integrated with an Enterprise Resource Planning (ERP) system.
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