In Chapter $12,$ Lenny remembers one of Dr$.$ Deming's principles. He also notes that Intelogic doesn't provide adequate time buffers.

Dr$.$ Deming's teaching is what Stein Industries and other successful Drum$-$Buffer$-$Rope users have done to focus their implementations.

That principle is:

"Trying to optimize within the noise not only doesn't help, it hurts." So$,$ only optimize the constraint, not the entire facility.

"Larger safety stock will provide buffer to constrained stations, but will also introduce confusion into an otherwise simple environment."

"Improved technology will always outperform sheer strength and speed."

"Increasing capacity will always be more costly than improving capacity."