Pareto chart
Where do the problems concentrate, and did that shift after the rev rule?
How this sheet sits with the others
Across twelve weeks, wrong revision leads with 86, then seat-face scratch with 71. Missing seal is 24, confirm posted on the wrong day is 22, count mismatch is 19, and mixed heat is 8. In the last 10 production days after the rev rule, scratches lead with 17 and wrong revision is 4. Mixed heat is 0 in that recent window. The chart shows where the counts concentrate. It does not show the sequence of days, and it does not test a cause.
- What it makes visible
- The twelve-week counts and the last 10 production days after the rev rule.
- When it is useful
- When the team needs to see whether the leading problem changed after a countermeasure.
- Who uses it
- Mara Ellison and Priya Shah, comparing the long window with the days after 21 September.
- What it takes
- Counts by category for the full window and for the recent window.
- What it leaves
- The full window is led by wrong revision, at 86. The recent window is led by scratches, at 17, with wrong revision at 4.
- The underlying record
- Wrong revision, seat-face scratch, missing seal, a confirm on the wrong day, count mismatch, and mixed heat are the counts the check sheet samples and the A3 is opened against.
Where these facts go next
What this sheet still leaves out
It has no time series and no cause test.