Architecture and design are abstractions until they are expressed in specific artifacts: design specifications and maquettes.
A System Metaphor and Concept bring all elements (System Quality Attributes) together..
A system metaphor is a story that everyone - clients, programmers, and managers - can tell about how the system works.
A concept is a semantic unity that every element – controls, pages and forms, classes and objects, modules and components, processes and applications – inherits when it is defined and implemented.
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