If you think of functional requirements as those that define what a system is supposed to do, non functional requirements (NFRs) define constraints which affect how the system should do it.. What is a non-functional requirement? Usability is a non-functional requirement, because in its essence it doesn't specify parts of the system functionality, only how that functionality is to be perceived by the user, for instance how easy it must be to learn and how efficient it must be for carrying out user tasks. Nonfunctional requirements can be classified based on the user’s need for software quality. Addressing a user concern will necessitate the formulation of a number of functional requirements, but the user concerns will also act to constrain other requirements that are characteristic of nonfunctional requirements. It is designed to test the readiness of a system as per nonfunctional parameters which are never addressed by functional testing. How well non-functional requirements are defined and executed determines how easy the system is to use, and is used to judge system performance. (b) Non-Functional Requirements List and briefly describe the main non-functional requirements for the LAABS. The resulting list becomes your Functional Requirements. Non-functional requirements examples. The answer is usability. A usability requirement specifies how easy the system must be to use. While a system can still work if NFRs are not met, it may not meet user or stakeholder expectations, or the needs of the business. The system must be available at any time of the day for customers to book flights and for TEO Hong to check on any details for the bookings or the system. Non-functional requirements define system behaviour, features, and general characteristics that affect the user experience. The list of basic non-functional requirements includes: Usability The definition of non-functional requirements is quality attributes that describe ways your product should behave. What is a Non-Functional Requirement? They are also known as quality or supplementary requirements. NON-FUNCTIONAL TESTING is defined as a type of Software testing to check non-functional aspects (performance, usability, reliability, etc) of a software application. "The system shall be easy to use" seems a bit vague to me, and not testable. I am writing a system requirements document and need to include non-functional requirements relating to the usability of the system, but am not sure of the best way to express this. Non-Functional Requirements SEG3101 (Fall 2010) 2 SEG3101 (Fall 2010). Usability requirements: The system must be able to be used on mobile phones as an application for easy use. If you can not measure it, you can not improve it.1 [1] Lord Kelvin (1824 - 1907) 3 SEG3101 … July 1, 2016. admin. 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