OPS.15.1:2 - Problem

An operating name can conceal several measurement constructions. Time from customer request, internal release, service start or approval produces different intervals. Counting orders, visits, samples or occupied resources produces different populations. A shared event can belong to several accounts without becoming several occurrences.

Aggregation can hide these differences. A mean over completed cases omits those still waiting. Summed task durations double-count overlapping occupation. Missing end events are silently treated as zero or as completion at the observation cutoff. The resulting number may be calculated correctly from the records while answering another question.