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Definition: Lean Manufacturing or lean production or simply 'lean' is a production philosophy that aims at eliminating the expenditure of resources to any other goal but the creation of value for the end customer.
While preserving this customer value, lean focuses on the most efficient production methods.
LM can be viewed as a modern and more refined version of earlier efficiency efforts, such as Scientific Management (Taylor). But LM was derived mainly from the Toyota Production System and identified as "Lean" only in the 1990s by Womack c.s.
Typical methods used in LM are: the Seven Wastes, Five S, Kanban, SMED, Just-in-time, Poka Yoke, and Value Stream Mapping.