Week 8 | Non-functional Requirements

Non-functional Requirements


Non-functional Requirements have also been called the 'ilities' because they are most simply expressed like this:

•  usability
• reliability
• interoperability
• scalability
• security

A simple way to define non functional requirements is to match answer with question and define as non functional any requirement with no direct impact on individual user experience.

Non functional requirements have no direct impact on individual user experience (R. Doisneau)

There are other ones:

• Time to market
• Cost
• Speed
• [RAM]
• [secondary storage]

Anis Afiqah Mohd Farid
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