Solution architecture
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Solution(s) Architecture is either 1: Documentation describing the structure and behaviour of a solution to a problem. Or 2: A process for describing a solution and the work to deliver it.
It is a kind of architecture that aims to address specific problems and requirements, through the design of specific information systems or applications. It often leads to software architecture work and technical architecture work, and often contains elements of those.
It is relative of enterprise architecture. It may relate to a programme or project that derives from an enterprise architect's migration plan, but it does not have to.