OCE.2:4.1.3 - Stop in proportion to the decision
Ask which unresolved claim could reverse the next decision or make its use unsupported. Obtain another permitted observation only when it can change that decision, its warranted claim or its conditions enough to justify retrieval, participant effort and delay; use C.11.DUA when that appraisal is itself difficult. A sufficient existing result can end the inquiry. If neither rival explanation changes the current concept boundary, carry both into OCE.3 and stop. If a missing authority basis prevents an intervention, stop that intervention while preserving the account and permitted design work.
The result can be a few linked claims with a stated missing path. It need not be a census, a complete model, agreement among all participants or an admitted Work occurrence for every observation. Protect personal and commercially sensitive material according to the actual permission and professional conditions. If a source cannot be used, retain the resulting evidence limit; do not fill it with an inference from an unrelated case.