AnswerD
ExplanationThis questions is intended to ask students about types of waste in Lean principles.
Lean was born out of manufacturing practices but in recent time has transformed the world of knowledge work and management. It encourages the practice of continuous improvement and is based on the fundamental idea of respect for people. Womack and Jones defined the five principles of Lean manufacturing in their book ''The Machine That Changed the World''. The five principles are considered a recipe for improving workplace efficiency and include: 1) defining value, 2) mapping the value stream, 3) creating flow, 4) using a pull system, and 5) pursuing perfection.
Lean principles aim to eliminate waste in processes. The eight wastes of Lean principles are:
- Defects
- Over-production
- Waiting
- Not using talent
- Transport and handling
- Inventory
- Motion waste
- Excess processing
In the scenario, the component is processed more than necessary. The engineers try to make them as accurate as possible with very little tolerance. In fact, the component does not need to be that precise. This excesses buyer's requirements and incurs costs for both buyer and supplier. The scenario is an example of over processing (or excess processing).
Overprocessing is one of the seven wastes of lean manufacturing (or 7 mudas); Overprocessing is adding more value to a product than the customer actually requires such as painting areas that will never be seen or be exposed to corrosion.
Overprocessing as one of the seven wastes is caused by having unclear standards and specifications, many operators will try to do the best job possible and will not always be aware of what truly adds value to the product or even the end use. They will therefore often expend time polishing and finishing components that do not require it.
- CIPS study guide page 153-156
- Waste of Overprocessing; causes, costs, examples solutions, symptoms (leanmanufactur-ingtools.org)
LO 3, AC 3.4
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