OPS.15.1:4.2 - Relate the records to the operating events

For the events used in the calculation, recover the subject, event meaning and occurrence time as far as the available information supports them. Distinguish occurrence time from recording time when their difference affects the result. Reconcile time zones, clock offsets and timestamp precision before comparing events from different systems.

Recover the relationships needed by the question. A dispatch can concern several order lines; one machine cycle can process several parts; one invoice can cover charges for several deliveries. Keep the common event identifiable while following each related subject. A row per event-subject relation is a useful representation, but its row count is not automatically an event count.

Check what the recorded label establishes. “Completed” may mean that a worker reported completion, that inspection accepted the result or that the customer received it. If the receiving comparison needs a later event, either obtain it or report the result under the available boundary.

Use MMP.7 when selection, censoring or the recording procedure affects an inference. Missing records do not by themselves show that the corresponding work did not occur.