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The categories of quality metrics are as follows

Project metrics:

Project metrics provide a common understanding of a project. They manage, monitor, and control project performance in terms of scope, cost, time, and quality. They determine and analyze trends, and ascertain and improve capability and maturity levels. They include metrics such as:

• Schedule variance
• Cost variance
• Planned value
• Earned value
• Cost performance index
• Schedule performance index
• To-complete performance index

Product metrics:

These metrics refer to the product quality attributes. They are specific to the application area and are governed by the product quality standards specified by the customer. They include metrics such as:

• Component quality
• Defect frequency
• Defect density
• Availability
• Mean Time Between Failures (MTBF)
• Mean Time To Repair (MTTR)

Process metrics:

They refer to the process capability of product realization processes and are specific to the application area. These metrics are related to the process effectiveness and efficiency.

They are used for continuous process improvement and are practiced within the QMS of the organisation. For example, statistical software process improvement helps an organisation in identifying their strong and where weak areas.