What it shows
One bubble per plant: cost of quality as a percentage of revenue (or cost per record without revenue) across, the prevention-to-failure ratio up, bubble size revenue (or total cost).
Why it matters in manufacturing
It puts every plant in one of four stories, so you see which sites spend wisely and which under-invest in prevention, and where to share practices.
How to read it
The dashed lines are the medians across plants. Top left (low cost, high prevention) spends wisely; bottom right (high cost, low prevention) pays for failure. It needs at least three plants.
What good looks like
Plants sit in the top left, spending on prevention with a low cost of quality, and plants move from the bottom right towards it over time.