In today’s lesson, we go over a very powerful tool in QuikSigma, the Process Sigma Level Calculator. Get your QuikSigma license here.
In your project charter you stipulated a baseline condition as part of your key metric. Under the measure phase you’ll expand that in one or more of the three tools that are provided here. Possibly the most powerful is behavior charts and process capability. Not to be overlooked is pareto analysis which is a simple and powerful tool. Finally, if you want to express the quality of your process in sigma’s you can do that with a sigma calculator. I have pre-loaded that just to show you that if we test a million units with one opportunity for a defect per unit, and we find 3.4 defects, we get oddly, 3.4 defects per million opportunity, a sigma equivalent of 4.5 sigmas. If you like the 1.5 sigma shift, that would then make 3.4 defects per million opportunities equal to a six sigma process.
Let’s just walk through one other example. Let’s say that I’ve tested 1,000 units and I’ve got 5 opportunities each per defect. This really needs to be an integer. You don’t find 4/10ths of a defect. The math still works but it doesn’t happen in real life. Let’s say that in 1,000 units with 5 opportunities each I found 4 defects. I would then find that I’ve got .003 Defects Per Unit (DPU). That’s a useful number. We’ve got 6/10,000 roughly of a defect per opportunity which is kind of awkward. It’s easier to express that as 680 Defects Per Million Opportunities (DPMO). Then depending on whether or not you like the 1.5 sigma shift we’ve either got a 3.2 sigma process or a 4.66 sigma process.