Categories of NFR (BABoK)

Question 1

Availability

Answer 1

degree to which the solution is operable and accessible when required for use, often expressed in terms of percent of time the solution is available.

Question 2

Compatibility

Answer 2

degree to which the solution operates effectively with other components in its environment, such as one process with another.

Question 3

Functionality

Answer 3

degree to which the solution functions meet user needs, including aspects of suitability, accuracy, and interoperability.

Question 4

Maintainability

Answer 4

ease with which a solution or component can be modified to correct faults, improve performance or other attributes, or adapt to a changed environment.

Question 5

Performance Efficiency

Answer 5

degree to which a solution or component performs its designated functions with minimum consumption of resources. Can be defined based on the context or period, such as high-peak, mid-peak or off-peak usage.

Question 6

Portability

Answer 6

ease with which a solution or component can be transferred from one environment to another.

Question 7

Reliability

Answer 7

ability of a solution or component to perform its required functions under stated conditions for a specified period of time, such as mean time to failure of a device.

Question 8

Scalability

Answer 8

degree with which a solution is able to grow or evolve to handle increased amount of work.

Question 9

Security

Answer 9

aspects of a solution that protect solution content or solution components from accidental or malicious access, use, modification, destruction, or disclosure.

Question 10

Usability

Answer 10

ease with which a user can learn to use the solution.

Question 11

Certification

Answer 11

constraints on the solution that are necessary to meet certain standards or industry conventions.

Question 12

Compliance

Answer 12

regulatory, financial, or legal constraints which can vary based on the context or jurisdiction.

Question 13

Localization

Answer 13

requirements dealing with local languages, laws, currencies, cultures, spellings, and other characteristics of user, which requires attention to the context.

Question 14

Service Level Agreement

Answer 14

constraints of the organization being served by the solution that are formally agreed to by both the provider and the user of the solution.

Question 15

Extensibility

Answer 15

the ability of a solution to incorporate new functionality.