Introduction

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?

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