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Software architecture design involves making many design decisions, and software architects should document those decisions along with their design rationale. While design sketches may explain what was designed, they don't give any indication as to the design rationale.
A design rationale explains the reasons, and justification, behind the decisions that are made during the design of the software architecture. Design rationale can also include documentation on what decisions were not made, as well as alternatives that were considered for decisions that were made. Reasons for rejection can be recorded for each alternative that was not selected.
Recording design rationale can be useful during the design process, .
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