ISO International Electronical Commission 9126 represents one of many models around software quality to guarantee. Not the process quality exclusively refers to the product quality and.

The following quality criteria are specified: (Partial characteristics are specified, in the appendix of the standard, only as suggestions! ):

• Functionality: To what extent does the software possess the demanded - Presence characteristics fixed by functions with. These functions fulfill the defined requirements.
  • Suitability: Suitability of functions for specified tasks, e.g. job oriented composition of functions from subfunctions.
  • Correctness: Supply the correct or agreed upon results or effects, e.g. the necessary accuracy of computed values.
  • Interoperability: Ability to cooperate with given systems.
  • Security: Ability, unauthorized access, both inadvertently and deliberately to prevent on programs and data.
  • Conformity: Degree, in which the software fulfills standards or agreements to functionality.
• Reliability: Can the software maintain a certain Leistungsniveau under certain conditions during a certain - Ability of the software to retain their Leistungsniveau under fixed conditions during a fixed period.
  • Matures: Small failure frequency by error conditions.
  • Error tolerance: Ability to retain a specified Leistungsniveau during software errors or disregard of their specified interface.
  • Robustness: Ability to ensure a stable system during inputs which are not at all intended. The software withstands DAU's.
  • Restorability: Ability to re-establish with a failure the Leistungsniveau and to recover the data directly concerned. To consider are the time needed for it and the necessary expenditure.
  • Conformity: Degree, in which the software fulfills standards or agreements to the reliability.
• Usability: Which expenditure does the employment of the software of the users demand and how is it judged by - Expenditure, which are necessary for the use, and individual evaluation of the use by a fixed or presupposed user group.
  • Comprehensibility: Expenditure for the user to understand the concept and application.
  • Ability to learn: Expenditure for the user to learn application (e.g. operation, in, expenditure).
  • Operability: Expenditure for the user to serve application.
  • Attractiveness: Attraction of application opposite the user.
  • Conformity: Degree, in which the software fulfills standards or agreements to the usability.
• Efficiency: How does the relationship lie between Leistungsniveau of the software and the assigned operational - Relationship between the Leistungsniveau of the software and the range of the assigned operational funds under fixed conditions.
  • Time performance: Answer and working times as well as throughput during the function execution.
  • Consumption behavior: Number and duration of necessary operating means with the fulfilment of the functions. Resource consumption, like CCU time, non removable disk access etc.
  • Conformity: Degree, in which the software fulfills standards or agreements to the efficiency.
• Alteration capability: Which expenditure does the execution of given changes at the software - Expenditure, which is necessary for the execution of given changes. Changes know corrections, improvements or adjustments at changes of the environment, which requirements or the functional specifications include.
  • Analysis possibility: Expenditure, in order to diagnose or to determine around parts requiring modification lack or causes from failure to.
  • Modifiableness: Expenditure for the execution of improvements, for the error correction or adjustment of changes of environment.
  • Stability: Probability of the occurrence of unexpected effects of changes.
  • Controllability: Expenditure, which is necessary for the examination of the changed software.
• Transferability: Can the software how easy be transferred into another - Suitability of the software to be able to be transferred by the environment into another. Environment can be organizational environment, hardware or software environment.
  • Adaptability: Ability of the software to adapt these to different environments.
  • Installation barness: Expenditure, which is necessary for installing the software in a fixed environment.
  • Coexistence: To work ability of the software beside another with similar or same functions.
  • Exchangeability: Possibility of using this software in place of specified different in the environment that software as well as the expenditure necessary for it.
  • Conformity: Degree, in which the software fulfills standards or agreements to the transferability.

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