“Another description of Lean is to think of it as a system, one that is designed to identify problems, and then resolve them at a root-cause level. Given that 99 percent or more of our daily problems are ‘resolved’ at the level of the first symptom, and consequently recur, over and over and over and over, truly resolving them at a root level is a big deal.”  

Leading the Lean Enterprise Transformation (2nd Ed.) by George Koenigsaecker (CRC Press, 2013) p. 13