Honestly, the last bit of formal and substantive math that I worked with was back in college. Many, many years ago, I received a B.S. in Mathematics, but other than the diploma, there is little physical or intellectual (!!) evidence that would support this reality.
My former classmates might say the same was true way back when. My kids? Well, they used to hesitate before asking me to help them with their math homework.
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We are constantly confronted with data. Some good, some bad, some out of this world.
When discussing lean math with other folks, I often get some less than optimal responses. Of course, much of the time it's probably me!
In any case, this is how I would characterize the more non-value-adding responses to the subject.
A contribution from one of our readers - Troy Bourgeois from Flow Consulting
The 10X ROI (Productivity Improvements in parallel with Sales growth)