[akolbe]

Certainly there was an entire cottage industry of well-paid consultants popularising these ideas around the 80s and 90s and yes, there was something distinctly cult-like about the scene and the Six Sigma Green Belt and Black Belt trainings that grew out of them.

That's not the fault of the ideas though, many of which are just common sense.

I was involved in the production of interactive video training courses on SPC and related topics in the late 1980s and early 1990s ... the first ones still used 12" laserdiscs; the DVD and the internet hadn't been invented yet. :))