What it shows
Each month's cost per bucket as stacked columns, with the total as a line and a dashed trend line through the total.
Why it matters in manufacturing
Monthly figures show whether quality cost moves, and which bucket moves it. Seasonal effects, one-off events and slow drifts become visible.
How to read it
Watch the colours as well as the height: shrinking failure parts with a steady or growing prevention part is the improvement you want. The trend legend gives the change per month and how predictable it is (R²); click it to hide the line. A forecast horizon continues the total for 3 or 6 months with the shaded bands where it will probably fall (80% and 95%). Click a column to drill down to plants and processes.
What good looks like
Columns that get lower over the months, with smaller failure parts and a steady prevention part, and a trend line that points down with a high predictability.