SYSE.46:5.1 - Separate support benefit from the choice to obtain it
In a constructed service-update diagnostic, the optional contribution is documentation lookup; execution, current-state checks and permission remain common. E supplies an applicable procedure premise, R leaves a decisive procedure fact only in the reachable source, and T supplies a sufficient premise while offering an irrelevant source.
| Situation | No optional lookup | Source operation supplied | Agent chooses support under the current rule |
|---|---|---|---|
| E: sufficient applicable premise | Completes correctly. | Completes, with acquisition that adds no premise. | Completes after two redundant lookups. |
| R: decisive premise missing | Returns the missing fact; completion is unsupported. | Binds and performs the source call, uses the fact and completes. | Skips the available call, guesses and fails. |
| T: sufficient premise, irrelevant offered source | Completes correctly. | Rejects the irrelevant return and completes from its premise. | Repeats the irrelevant lookup twice, then completes from the premise. |
The stipulated R trace locates missed assistance selection, because the usable call was skipped. If the call had been chosen with a wrong target, repair invocation instead; if the returned fact disappeared from the next input, repair input preparation; if it remained visible but control sent the task back to retrieval, repair the procedure. E and T reveal unnecessary work despite correct answers. Count required effect verification and a sufficient-result stop as well as calls and completion.
After the selected rule repair, unused matched cases must show E using its supplied premise, R obtaining and using the needed source, and T declining irrelevant acquisition, while keeping the actual-state and at-most-one-effect checks. Fewer calls with a guessed R answer fails. The Reference works the whole repair comparison. This table defines an illustrative diagnostic, not observed effectiveness.