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SYSE.19:4.3 - What Changes in Practice

Engineers stop using a source version as a proxy for impact. A source update can matter while the engineered System stays unchanged because the warranted decision basis changed. A carrier update can leave engineering decisions usable when claim content and applicability remain compatible.

Revalidation produces a bounded decision result: it identifies decisions that remain usable and decisions that need new Work. Search and AI-assisted comparison reduce discovery effort, while an Agent with suitable capability and authority judges materiality and applicability.