The Cost of Quality (COQ) framework helps organizations understand how their resources are allocated across different quality-related activities. Here are the key categories within COQ:

Prevention Costs: These costs are incurred to prevent defects from occurring in the first place. Investing in prevention activities reduces the likelihood of quality issues. Examples include:

Training programs

Process improvement initiatives

Design reviews

Supplier quality management

Appraisal Costs: These costs are associated with measuring and monitoring quality. They ensure that products or services conform to specifications. Examples include:

Quality audits

Verification of incoming materials

Supplier evaluations

Internal Failure Costs: These costs occur when defects are detected before the customer receives the product or service. Investing in reducing internal failures is crucial. Examples include:

Rework or rectification

Scrap

Failure analysis

External Failure Costs: These costs arise when defects are discovered by customers after they have received the product or service. External failures can damage reputation and lead to customer dissatisfaction. Examples include:

Repairs and servicing of returned products

Warranty claims

Product recalls

To maximize return, organizations should focus on prevention because it directly reduces the occurrence of defects, leading to long-term cost savings. By preventing issues upfront, companies avoid the more expensive internal and external failure costs1.

 1: ASQ: What is Cost of Quality (COQ)?