Many companies use SPC to control their manufacturing and assembly processes. Other companies use 100% inspection and some companies do nothing. How can one choose between these three alternatives?
To make a rational choice, some questions need to be answered.
- What are the costs of internal and external failure on similar product?
- Is the product design and/or process flow new, modified or carryover?
- Are critical characteristics for the part and process known?
- Are the process capabilities known?