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ISO/IEC 25010

The quality model is the cornerstone of a product quality evaluation system. The quality model determines which quality characteristics will be taken into account when evaluating the properties of a software product.

The quality of a system is the degree to which the system satisfies the stated and implied needs of its various stakeholders, and thus provides value. Those stakeholders' needs (functionality, performance, security, maintainability, etc.) are precisely what is represented in the quality model, which categorizes the product quality into characteristics and sub-characteristics.

The product quality model defined in ISO/IEC 25010 comprises the eight quality characteristics shown in the following figure:

Quality Characterisctics of ISO 25010

Functional Suitability

This characteristic represents the degree to which a product or system provides functions that meet stated and implied needs when used under specified conditions. This characteristic is composed of the following subcharacteristics:

  • Functional completeness. Degree to which the set of functions covers all the specified tasks and user objectives.
  • Functional correctness. Degree to which a product or system provides the correct results with the needed degree of precision.
  • Functional appropriateness. Degree to which the functions facilitate the accomplishment of specified tasks and objectives.

Performance efficiency

This characteristic represents the performance relative to the amount of resources used under stated conditions. This characteristic is composed of the following subcharacteristics:

  • Time behaviour. Degree to which the response and processing times and throughput rates of a product or system, when performing its functions, meet requirements.
  • Resource utilization. Degree to which the amounts and types of resources used by a product or system, when performing its functions, meet requirements.
  • Capacity. Degree to which the maximum limits of a product or system parameter meet requirements.
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