Explain about non-functional requirement for a software, Software Engineering

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Q. Explain about non-functional requirement for a software ?

Ans) Nonfunctional requirements are the basic characteristics of the system which will not be expressed as functions - such as portability of the system, maintainability of the system, usability of the system, etc.

Nonfunctional requirements can include:

# performance issues,

# reliability issues,

# interface with other external systems,

# human - computer interface issues,

# security and maintainability of the system, etc.

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