What are functional and non-functional requirements of system development methodology?

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Functional requirements are observable tasks or processes that must be performed by the system under development. For example, a functional requirement of a stock trading system is "must update and remember stock prices;" for a web search engine, "must accurately parse boolean queries;" for an automated teller machine, "must process withdrawals and dispense cash to the customer."

Non-functional requirements are qualities or standards that the system under development must have or comply with, but which are not tasks that will be automated by the system. Example non-functional requirements for a system include: "system must be built for a total installed cost of $1,050,000.00;" "system must run on Windows Server 2003;" "system must be secured against Trojan attacks."

It is important to note that these kinds of requirements always exist, regardless of the approach or method used to manage software development. A software development methodology helps to identify, document, and realize the requirements.

First answer by ID2063393795. Last edit by Momento. Contributor trust: 2 [recommend contributorrecommended]. Question popularity: 5 [recommend question].