Identify Potential Causes
In This Chapter
♦ Brainstorming root causes
♦ Wayne and Fred’s fishing expedition
♦ Affinities, Fishbones, and FMEAs
♦ Selecting the vital few
♦ Time or defects?
Congratulations! You know a lot about Y (your primary metric). You know why the customer wants improvement in Y from the Define phase, and the Measure phase documented the as-is process for producing Y. You determined the best way to measure Y, and you now know the capability of Y to meet your requirements (internal or external). In Analyze, your focus turns to the xs (inputs, process controls, decisions) that influence the behavior of Y.
In this chapter, our investigation of potential causes begins—much like a TV crime show—by gathering evidence and ...