B.2:5.5 - Same Whole, New Whole, And Lost Evidence

Replacing Pump #37’s seal is an ordinary constituent change when the pump’s reidentification rule admits that maintenance phase. The same pump remains the EntityOfConcern; use the direct maintenance, part-relation, work, transformation, and characteristic patterns and stop B.2.

Closing a controller-sensor-actuator loop can yield a new regulated-system whole only when the exact candidate assembly, supervision and coordination relations, boundary, objective, whole-level capability, admitted U.System kind, and reidentification rule satisfy A.1 and the system criterion. Its actual boundary, interfaces, relevant characteristics, and identity-preservation conditions must also satisfy at least one applicable governed larger-assembly construction method or rule under which the regulated system can remain a constituent. If that condition fails, the candidate fails A.1; if the needed evidence or dependency is unavailable, evaluation returns unknown. A wiring diagram, commissioning record, loop closure, or capability measurement alone supplies none of those construction or compatibility facts.

If the support for the reidentification assertion is present and its edition is current, a person or system performing receiving work may rely on it. If the same evidence is unavailable, evaluation can return unknown; use G.11 to test whether the edition is current for this use; and the actor may decline, defer, or reopen. None of those branches changes whether the regulated-system whole actually exists or whether the prior configuration remains the same whole.