Taguchi Loss Function | Parabolic Goalposts | Sticker

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Brighten up any dull spot with this colorful tribute to the TLF and quality champion, Genichi Taguchi.

Taguchi Loss Function! The TLF, yo. You down with parabolic goalposts? Yeah you are.

A fun lean six sigma insider's gift. Lean manufacturing experts, operational excellence pros, six sigma peeps, and industrial engineers are going to dig this comic.

Why would artist Leimar Bolivar (Venezuela) imagine Taguchi as a placekicker for an American football team? 

#IYKYK. If you don't know...

Genichi Taguchi was an engineer, a statistician, and a champion of quality. His quotable, “Imprecision is a loss for society,” underscores that he was a team player for all of us.

If you’re here shopping for a friend or loved one in the quality tribe, or if you’re unfamiliar with the rules of American football, we will elucidate.

When kicking a field goal, your team gets their three points whether the ball goes right down the middle or skims the edge of the yellow upright. It doesn’t matter. In is in. That’s fine for football but when an ideal measure exists, “goal post thinking” welcomes a degree of imprecision that degrades quality and customer satisfaction. In manufacturing-speak, as long as the part is within specifications, we’re good. But skimming the edge of the specs isn’t good. It represents a loss. The parabolic Taguchi Loss Function discourages goal-post thinking.

There’s even an equation that calculates the loss: L(x) = K * (x - T)^2.

Regarding the brilliant Mr. Taguchi, take it away Wikipedia…

Taguchi realized that in much industrial production, there is a need to produce an outcome on target, for example, to machine a hole to a specified diameter, or to manufacture a cell to produce a given voltage. He also realized, as had Walter A. Shewhart and others before him, that excessive variation lay at the root of poor manufactured quality and that reacting to individual items inside and outside specification was counterproductive.

He therefore argued that quality engineering should start with an understanding of quality costs in various situations. In much conventional industrial engineering, the quality costs are simply represented by the number of items outside specification multiplied by the cost of rework or scrap. However, Taguchi insisted that manufacturers broaden their horizons to consider cost to society.

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