IT:AD:FURPS

(UP)

* See also:

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* IT:AD:Supplemental Specifications

• IT:AD:Non-Functional Requirements
• IT:AD:Requirements
• IT:AD:ISO 9126
• Business:Concepts:Quality

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FURPS+ stands for:

• Function Requirements: cross-system requirements.
• Usability Requirements: UX consistency, usability, accessibility, aesthetics.
• Reliability Requirements: availability, accuracy, recoverability.
• Performance Requirements: throughput, response time, recovery time, start-up time, and shutdown time.
• Supportability Requirements: testability, adaptability, maintainability, compatibility, configurability, installability, scalability, and localizability.

The '+' define the following constraints: * Design requirements: architectural, infrastructural constraints. * Implementation requirements: coding constraints (standards, language, resource limits). * Interface requirements (SAML, REST, throughput, schedule, format, with what system) * Physical requirements (not often an issue with software, but location, shape, size, weight)

* Advantages:

• In addition to providing a way of classifying IT:AD:Non-Functional Requirements, IT:AD:FURPS provides a framework to define System IT:AD:Functional Requirements.

* Considerations:

• The acronym is valuable at ensuring key requirements are not missed – but there is risk in getting complacent and believing the acronym covers all requirements.
  • This is why IT:AD:FURPS ended up being replaced by first IT:AD:ISO 9126 and then IT:AD:ISO 25010

* Disadvantages:

• The term Supplemental in an unfortunate choice: stakeholders do not readily see their value, instead perceiving the supplemental specifications as afterthoughts to the Functional Requirements.

* http://www.ibm.com/developerworks/rational/library/4706.html#N100A7