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SYSE.13:3 - Forces

Recurring tensions include:

  • A change can preserve or end an entity’s identity; reusing its earlier label settles neither case.
  • Design, manufacturing, integration, operation, and maintenance need different item boundaries, while receiving Work needs supported mappings among them.
  • Family descriptions enable reuse; release, service, and failure decisions often depend on serial units and installed configurations.
  • Extra fields and links cost maintenance, while one omitted unit, edition, condition, or correspondence can invalidate the choice.
  • Several descriptions can agree with each other and still be wrong about the actual System.
  • Automated comparison exposes differences among identifiers, bills, hashes, and editions quickly. Engineers still determine the intended referent, applicability, and acceptable loss.
  • A selected reference basis aids comparison while experimental, installed, and service configurations can legitimately coexist.