The software production and business environment is becoming more and more competitive, customers have more and better choices of high-quality products or services on the market.
Companies must differentiate themselves from the competition by hearing customer requirements and providing products or services that meet customer requirements with high levels of reliability and quality.

  • The cost of quality (CoQ)

The cost of quality is all of the costs that the software development team must bear to ensure the production of quality products or services.
The cost of quality allows the software development team to analyze the causes of problems and improve their products or services.
The cost of quality associated with a project consists of the cost of good quality and the cost of poor quality.
The cost of good quality (Cost of conformance) includes Prevention costs and Appraisal costs.
The cost of poor quality (Cost of nonconformance) includes Internal failure costs and External failure costs.

  • Prevention costs

These are costs associated with preventing problems and errors from occurring during the development of a product or service.
This includes activities such as training, process improvement, quality management planning, etc.

  • Appraisal costs

These are costs associated with evaluating product or service quality by finding errors and detecting defects during the development of a product or service.
This includes activities such as testing, inspection, etc.

  • Internal failure costs

Internal failure costs are the costs that arise when problems or issues are found and corrected before the product or service is released to users.
This includes costs associated with rework, scrap, etc.

  • External failure costs

External failure costs are the costs that arise when problems or bugs are found in a product or service after it has been released to users.
This includes costs associated with customer complaints, warranty claims, etc.

In summary, the cost of quality plays an important role in ensuring the quality of a product or service and creating value for customers.
The software development team should invest in preventing problems and errors from occurring by training employees on quality,
improving quality control processes and strengthening evaluation activities of product quality in the production process to ensure that the product or service meets quality standards and customer requirements.
The optimal cost of quality reflects the appropriate balance for investing in the cost of prevention and appraisal to avoid failure costs (internal/external).

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