Starting from previous functional and non-functional need analysis, a first definition of the solution expected behavior is performed using functions, interfaces, data flows, behaviors…. In order to embed these functions, one or several decompositions of the system into logical components are to be built, each function being allocated to one component. The building process has to take into account architectural drivers and priorities, viewpoints and associated design rules , etc.
For the component breakdown to be stable in further engineering phases, all major non-functional constraints safety, security, performance, IVV, cost, non-technical, Etc. This method is described as "viewpoint-driven", where viewpoints formalize the way these constraints impact the system architecture. Outputs of this engineering phase consist of the selected logical architecture which is described by a functional description, components and justified interfaces definition, scenarios, modes and states, along with the formalization of all viewpoints and the way they are taken into account in the components design.
Since the architecture has to be validated against the need analysis, links with requirements and operational scenarios are also to be produced. Once this is done the model is considered ready to develop by "lower" engineering levels. Therefore, it introduces further details and design decisions, rationalization, architectural patterns, new technical services and behavioral components, and makes the logical architecture vision evolve according to implementation, technical and technological constraints and choices.
It notably introduces resource components that will embed former behavioral components. The same viewpoint-driven approach as for logical architecture building is used. Outputs of this engineering phase consist of the selected physical architecture which includes components to be produced, formalization of all viewpoints and the way they are taken into account in the components design.
Links with requirements and operational scenarios are also produced. The fifth and last perspective is a contribution to an EPBS End-Product Breakdown Structure , and models describing specification of each sub-system, hardware or software component; it takes benefits from the former architectural work, to formalize the component requirements definition and prepare a secured IVVQ.
All previous hypotheses and imposed constraints associated to the system architecture and components are summarized and checked here.
Outputs from this engineering phase are mainly new models describing component integration contracts , collecting all necessary expected properties for each component to be developed. The physical architecture is the preferred place for co-engineering between systems, software, and hardware stakeholders.
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