When we learn the ways of lean methodology, we’re taught that there are two types of waste: pure waste, which needs to be eliminated; and necessary waste, which does nothing to improve our performance or profits but must be produced anyway.

And so the debate rages on about whether the wildly popular Flappy Bird app is actually a tool for teaching lean or teaching theory of constraints. Really? No, not really. But at least I’m not the only one thinking about it.

With more options come more decisions. With equivalence testing added to Minitab 17, you now have more statistical tools to test a sample mean against target value or another sample mean.

To summarize my last three articles, most improvement approaches come out of the same theory and are based on the assumption that everything is a process.

Ugh, your process is producing some parts that don’t meet your customer’s specifications. Fortunately, after a little hard work, you find a way to improve the process.