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What is waste?
Waste refers to anything which does not advance the process, everything that does not increase added value. Many people settle for eliminating the waste that everyone recognizes as waste. But much remains that simply has not yet been recognized as waste or that people are willing to tolerate.
People resign themselves to certain problems, become hostage to routine and abandon the practice of problem-solving. - Shigeo Shingo, Study of the Toyota Production System, 1989