What it shows
Rings from the centre out: the four buckets, then the processes (analysis sets) within each bucket, with an optional ring for the plants in between. The size of a segment is its cost.
Why it matters in manufacturing
It shows how the money of each bucket splits over processes, so you see which few processes carry a bucket and where improvement would pay off most.
How to read it
Compare the segments within one ring: a wide segment holds a large part of its bucket. Click a segment to zoom in and the centre to go back. Small processes are grouped as Other sets.
What good looks like
Small failure segments, and within each bucket no single process taking most of the ring.