cost of quality
Cost of Quality (COQ)
"The cost of quality."
It’s a term that's widely used – and widely misunderstood.
The "cost of quality" isn't the price of creating a quality product or service. It's the cost of NOT creating a quality product or service.
Every time work is redone, the cost of quality increases. Obvious examples include:
The reworking of a manufactured item.
The retesting of an assembly.
The rebuilding of a tool.
The correction of a bank statement.
The reworking of a service, such as the reprocessing of a loan operation or the replacement of a food order in a restaurant.
In short, any cost that would not have been expended if quality were perfect contributes to the cost of quality.
Total Quality Costs
As the figure below shows, quality costs are the total of the cost incurred by:
Investing in the prevention of nonconformance to requirements.
Appraising a product or service for conformance to requirements.
Failing to meet requirements.
Quality Costs—general description
Prevention Costs
The costs of all activities specifically designed to prevent poor quality in products or services.
Examples are the costs of:
New product review
Quality planning
Supplier capability surveys
Process capability evaluations
Quality improvement team meetings
Quality improvement projects
Quality education and training
Appraisal Costs
The costs associated with measuring, evaluating or auditing products or services to assure conformance to quality standards and performance requirements.
These include the costs of:
Incoming and source inspection/test of purchased material
In-process and final inspection/test
Product, process or service audits
Calibration of measuring and test equipment
Associated supplies and materials
Failure Costs
The costs resulting from products or services not conforming to requirements or customer/user needs. Failure costs are divided into internal and external failure categories.
Internal Failure Costs
Failure costs occurring
"The cost of quality."
It’s a term that's widely used – and widely misunderstood.
The "cost of quality" isn't the price of creating a quality product or service. It's the cost of NOT creating a quality product or service.
Every time work is redone, the cost of quality increases. Obvious examples include:
The reworking of a manufactured item.
The retesting of an assembly.
The rebuilding of a tool.
The correction of a bank statement.
The reworking of a service, such as the reprocessing of a loan operation or the replacement of a food order in a restaurant.
In short, any cost that would not have been expended if quality were perfect contributes to the cost of quality.
Total Quality Costs
As the figure below shows, quality costs are the total of the cost incurred by:
Investing in the prevention of nonconformance to requirements.
Appraising a product or service for conformance to requirements.
Failing to meet requirements.
Quality Costs—general description
Prevention Costs
The costs of all activities specifically designed to prevent poor quality in products or services.
Examples are the costs of:
New product review
Quality planning
Supplier capability surveys
Process capability evaluations
Quality improvement team meetings
Quality improvement projects
Quality education and training
Appraisal Costs
The costs associated with measuring, evaluating or auditing products or services to assure conformance to quality standards and performance requirements.
These include the costs of:
Incoming and source inspection/test of purchased material
In-process and final inspection/test
Product, process or service audits
Calibration of measuring and test equipment
Associated supplies and materials
Failure Costs
The costs resulting from products or services not conforming to requirements or customer/user needs. Failure costs are divided into internal and external failure categories.
Internal Failure Costs
Failure costs occurring