Where does Six Sigma fit in with Lean (and vice versa)?

In general, six sigma focuses on the value added elements of a process by reducing variation, and therefore defects, from the process. In contrast, the emphasis of lean is on eliminating waste from non-value added activities. The 7 wastes are overproduction, defects, unnecessary motion, inventory, space, transportation and waiting time.

Gembutsu's view is that lean and six sigma can work well together. Our approach is to "reduce lead-time through the elimination of waste" and we use any relevant tools that accomplish this objective.