How is it used inside of Toyota?
There are a variety of uses that we were exposed to in our respective time inside Toyota some time ago (Prof. Sobek conducting dissertation research and Mr. Smalley as an employee). Three uses that are most common are 1) structuring thinking and telling a concise PDCA story, 2) generating discussion with supervisors or other departments for feedback, and 3) mentoring in terms of problem solving skills development. There are others but these are probably the most common starting points.
