A twenty-page checklist, completeness judged by eye
The impact analysis for a change is done in a meeting, by hand, against a paper checklist. Nobody can say whether it is complete. Nothing reminds anyone of what was skipped.
of paper checklist, ticked by hand
« We estimate whether the analysis is complete. Finger in the air. »
How do you answer that today?
Impact is computed from the graph, not remembered in a meeting.