<Tr> <Td> </Td> <Td> This article does not cite any sources . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (November 2015) (Learn how and when to remove this template message) </Td> </Tr> <P> FURPS is an acronym representing a model for classifying software quality attributes (functional and non-functional requirements): </P> <Ul> <Li> Functionality - Capability (Size & Generality of Feature Set), Reusability (Compatibility, Interoperability, Portability), Security (Safety & Exploitability) </Li> <Li> Usability (UX) - Human Factors, Aesthetics, Consistency, Documentation, Responsiveness </Li> <Li> Reliability - Availability (Failure Frequency (Robustness / Durability / Resilience), Failure Extent & Time - Length (Recoverability / Survivability)), Predictability (Stability), Accuracy (Frequency / Severity of Error) </Li> <Li> Performance - Speed, Efficiency, Resource Consumption (power, ram, cache, etc .), Throughput, Capacity, Scalability </Li> <Li> Supportability (Serviceability, Maintainability, Sustainability, Repair Speed) - Testability, Flexibility (Modifiability, Configurability, Adaptability, Extensibility, Modularity), Installability, Localizability </Li> </Ul> <Li> Functionality - Capability (Size & Generality of Feature Set), Reusability (Compatibility, Interoperability, Portability), Security (Safety & Exploitability) </Li>

The r in the furps acronym stands for
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