The general concepts found in this section are: 1  The earth's atmosphere is a very thin layer wrapped around a very large planet. 2  Two gases make up the bulk of the earth's atmosphere: nitrogen (), which comprises 78% of the atmosphere, and oxygen (), which accounts for 21%.
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Lean manufacturing or lean production, often simply  lean , is a systematic method for the elimination of waste ( Muda ) within a manufacturing system.ean principles are derived from the Japanese manufacturing industry. The term was first coined by John Krafcik in his 1988 article, Triumph of the Lean Production System, based on his master's thesis at the MIT Sloan School of Management.