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Source changed 2026-10-03 11:52:20 UTC · snapshot created 2026-10-03 11:53:41 UTC · last check 2026-10-03 13:40:10 UTC

SYSE.1:4.5 - Reopen the choice from the answer that failed

Reopen the account when one of these changes the comparison:

  • observed or expected use crosses the assumed boundary;
  • authority or permission makes the intended change unavailable;
  • an architecture candidate moves important functioning to another System;
  • no feasible realization branch supports the selected referent;
  • operating or assurance evidence defeats the reason for the choice; or
  • a related project is separated, combined, or reoriented in a way that changes the current project decision.

Return to the smallest failed claim. A changed use assumption may require SYSE.2 before the project focus changes. A failed bearer or architecture candidate may return through C.30 or C.32. Reopen SYSE.1 only when the evidence changes which System should orient this project or where the project boundary lies.