FURPS

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FURPS (Functionality, usability, reliability, performance, supportability) is a model for classifying software quality attributes (functional and non-functional requirements):

Model

• Functionality - capability (size and generality of feature set), reusability (compatibility, interoperability, portability), security (safety and exploitability)
• Usability (UX) - human factors, aesthetics, consistency, documentation, responsiveness
• Reliability - availability (failure frequency (robustness/durability/resilience), failure extent and time-length (recoverability/survivability)), predictability (stability), accuracy (frequency/severity of error)
• Performance - speed, efficiency, resource consumption (power, ram, cache, etc.), throughput, capacity, scalability
• Supportability (serviceability, maintainability, sustainability, repair speed) - testability, flexibility (modifiability, configurability, adaptability, extensibility, modularity), installability, localizability

The model, developed at Hewlett-Packard was first publicly elaborated by Grady and Caswell. FURPS+ is now widely used in the software industry. The + was later added to the model after various campaigns at HP to extend the acronym to emphasize various attributes, such as Design Requirements, Implementation Requirements, Interface Requirements and Physical Requirements.

See also

• Types of requirements
• Expanded list of types of requirements

References

Further reading

• Watson, Mike (2006). Managing Smaller Projects: A Practical Approach. Multi-Media Publications Inc. pp. 117 ff. ISBN 978-1-895186-85-7.
• Kenett, Ron; Baker, Emanuel (1999). Software Process Quality: Management and Control. CRC Press. pp. 130 ff. ISBN 978-0-8247-1733-9.
• Nakajo, Takeshi; Sasabuchi, Katsuhiko; Akiyama, Tadashi (April 1989). "A Structured Approach to Software Defect Analysis" (PDF). Hewlett-Packard Journal. 40 (2). Palo Alto: Hewlett-Packard Co.: 50–56. Archived from the original (PDF) on 2023-03-13. Retrieved 2016-03-24.
• Fischer, William A. Jr.; Jost, James W. (April 1989). "Comparing structured and unstructured methodologies in firmware development" (PDF). Hewlett-Packard Journal. 40 (2). Palo Alto: Hewlett-Packard Co.: 80–85. Archived from the original (PDF) on 2023-03-13. Retrieved 2016-03-24.
• Grady, Robert; Caswell, Deborah (1987). Software Metrics: Establishing a Company-wide Program. Prentice Hall. pp. 159. ISBN 0-13-821844-7.
• Carter, Donald; Stilwell Baker, Barbara (1992). Concurrent Engineering, The Product Development Environment for the 1990s. Addision-Wesley. pp. 175. ISBN 0-201-56349-5.

External links

• IBM on Furps+