CESAM Systems Architecting Method

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Operational architecture, or equivalently operational analysis, intends to precisely understand the interactions among time between the system of interest and the external systems of its reference environment, or equivalently of its stakeholders. Motivations of environment architecture, as already discussed in...

Let S be a system. The need architecture diagram of S is then a hierarchical exhaustive representation of all needs with respect to S, a need N1 being under another need N2 in this hierarchy if and only if one...

Functional architecture, or equivalently functional analysis, intends to describe precisely the different functions of a system and their relative interactions. The core motivation of functional architecture is to start understanding and specifying in details the system, but only in terms...

Let S be a system. The functional requirement architecture diagram of S is then a hierarchical exhaustive representation of all functional requirements of S, a functional requirement R1 being under another functional requirement R2 in this hierarchy if and only...

Constructional architecture, or equivalently constructional analysis, intends to describe precisely the different components of a system, but also all their relative interactions. The core motivation of constructional architecture is to concretely understand and specify in details the system, in terms...

Let S be a system. The constructional decomposition diagram associated with S is then a hierarchical representation of the components of S, a set C1, C2, …, CN of components being under another component D in this hierarchy if D...

Systems architecting is not like mathematics since systems architecting issues have commonly never only true or false answers, which may be disorientating for the beginner. A systems architecture process does indeed classically lead to many different possible and valuable solutions....

Steps 1 to 3 can be typically prepared by the systems architect alone (or with a small team), without opening too much the circle of stakeholders. Steps 4 and 5 shall however necessarily be achieved through a collective decision process...