Lean manufacturing emphasizes the minimization of the amount of all the resources (including time) used in the various activities of the enterprise. The typical areas of hidden waste are over-production, waiting, transportation, over-processing, motion, excessive inventory, and defective units.
This is because, though lean does not necessarily set out to be mean in terms of relentless cost cutting, the approach of maximizing customer value and eliminating hidden waste (i.e., any activity that does not add value to the goods or service in the eyes of the consumer) inevitably leads to the removal of unnecessary operating costs (including some unneeded jobs). There are seven typical categories of hidden muda or waste, as follows. Overproduction . Overproduction consists of making either unneeded,