Muri (無理) is a Japanese word meaning "unreasonableness; impossible; beyond one's power; too difficult; by force; perforce; forcibly; compulsorily; excessiveness; immoderation",[1] and is a key concept in the Toyota Production System (TPS) as one of the three types of waste (muda, mura, muri).
[2] A direct example of Muri is asking workers to stay focused for a period exceeding 8 hours a day or expecting a machine to produce more than it can in a given time.
Some of the most common reasons why production systems experience overburdening:[citation needed] Muri is one of three types of waste (muda, mura, muri) identified in the Toyota Production System.
To achieve this a standard condition or output must be defined to assure effective judgment of quality.
Then every process and function must be reduced to its simplest elements for examination and later recombination.