In Inception, the concern is to establish feasibility and explore alternatives if necessary in Activity: Synthesize System Architecture. Given the nature of the systems under
development with this approach—often large, complex and with a mix of hardware, software, and people—it is unlikely
that this activity will be omitted. The behavior of the tentative architecture is examined in Activity: Analyze System Behavior, and the required behavior of the constituent
subsystems begins to emerge.
During Elaboration, the System Architecture is established, over one or more iterations, in Activity: Define Candidate System Architecture, and the required behavior of the
constituent subsystems is established. As discoveries are made or changes required, in any phase, the system
architecture is refined in Activity: Refine System Architecture.
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