Muda is traditional general Japanese term for activity that is wasteful and doesn't add value or is unproductive. It is also a key concept in the Toyota Production System and is one of the three types of waste (Muda, Mura, Muri) that it identifies. Reducing or eliminating muda is, of course, one of the fundamental objectives of any quality-oriented person.

          Taichi Ohno of Toyota identified what are called the seven wastes or seven mudas, being the most common form of muda found:

• Waste from overproduction
• Which leads to excess inventory, paperwork, handling, storage, space, interest charges, machinery, defects, people and overhead.
• It is often difficult to see this waste as everyone seems busy.
• Waste of time in waiting
• People may be waiting for parts or instructions.
• Mostly they are waiting for one another, which often happens because they have non-aligned objectives.
• Transportation waste
• Poor layouts lead to things being moved multiple times.
• If things are not well place, they can be hard to find.
• It can aggravate alignment of processes.
• Processing waste
• Additional effort may be required in an inefficient process.
• Inventory waste
• Excess buffer stocks a whole host of sins, which will be uncovered by gradually lowering inventory (doing it all at once will cause total breakdown!).
• Waste of motion
• This includes movement of people, from simple actions when in one place to geographic movement. Having everything to hand as it is needed reduces motion muda.
• Waste from product defects
• Defects cause rework, confusion and upset a synchronized set of processes.

A simplified view of muda is:

• Wasting time.
• Wasting a consumable resource, such as materials.
• Causing dissatisfaction (including incomplete satisfaction).

Source: http://www.syque.com

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