In product development and process optimization, a requirement is a singular documented physical or functional need that a particular design, product or process aims to satisfy. It is commonly used in a formal sense in engineering design, including for example in systems engineering, software engineering, or enterprise engineering. It is a broad concept that could speak to any necessary (or sometimes desired) function, attribute, capability, characteristic, or quality of a system for it to have value and utility to a customer, organization, internal user, or other stakeholder. Requirements can come with different levels of specificity; for example, a requirement specification or requirement "spec" (often imprecisely referred to as "the" spec/specs, but there are actually different sorts of specifications) refers to an explicit, highly objective/clear (and often quantitative) requirement (or sometimes, set of requirements) to be satisfied by a material, design, product, or service.
A set of requirements is used as inputs into the design stages of product development. Requirements are also an important input into the verification process, since tests should trace back to specific requirements. Requirements show what elements and functions are necessary for the particular project. When iterative methods of software development or agile methods are used, the system requirements are incrementally developed in parallel with design and implementation. With the waterfall model requirements are developed before design and implementation.
One of a set of choices that can be made. from the 19th c.
The freedom or right to choose.
A contract giving the holder the right to buy or sell an asset at a set strike price; can apply to financial market transactions, or to ordinary transactions for tangible assets such as a residence or automobile. from the mid-18th c.
A button on a screen used to select an action .
To purchase an option on something. from the 20th c
"The new novel was optioned by the film studio, but they'll probably never decide to make a movie from it."
To configure, by setting an option.
A necessity or prerequisite; something required or obligatory. Its adpositions are generally of in relation to who or what has given it, on in relation to whom or what it is given to, and for in relation to what is required.
"There was a requirement of the government on citizens for paying taxes."
A statement (in domain specific terms) which specifies a verifiable constraint on an implementation that it shall undeniably meet or (a) be deemed unacceptable, or (b) result in implementation failure, or (c)'' result in system failure.
a thing that is or may be chosen
"choose the cheapest options for supplying energy"
the freedom or right to choose something
"he has no option but to pay up"
"she was given the option of resigning or being dismissed"
a right to buy or sell a particular thing at a specified price within a set time
"Columbia Pictures has an option on the script"
buy or sell an option on
"his second script will have been optioned by the time you read this"
a thing that is needed or wanted
"choose the type of window that suits your requirements best"
a thing that is compulsory; a necessary condition
"applicants must satisfy the normal entry requirements"
The power of choosing; the right of choice or election; an alternative.
The exercise of the power of choice; choice.
A wishing; a wish.
A right formerly belonging to an archbishop to select any one dignity or benefice in the gift of a suffragan bishop consecrated or confirmed by him, for bestowal by himself when next vacant; - annulled by Parliament in 1845.
A stipulated privilege, given to a party in a time contract, of demanding its fulfillment on any day within a specified limit; also, the contract giving that privelege; as, an option to buy a stock at a given price; to exercise an option.
The act of requiring; demand; requisition.
That which is required; an imperative or authoritative command; an essential condition; something needed or necessary; a need.
the right to buy or sell property at an agreed price; the right is purchased and if it is not exercised by a stated date the money is forfeited
one of a number of things from which only one can be chosen;
"what option did I have?"
"there no other alternative"
"my only choice is to refuse"
the act of choosing or selecting;
"your choice of colors was unfortunate"
"you can take your pick"
"the requirements of his work affected his health"
"there were many demands on his time"
"food and shelter are necessities of life"
"the essentials of the good life"
"allow farmers to buy their requirements under favorable conditions"
"a place where the requisites of water fuel and fodder can be obtained"
something that is required in advance;
"Latin was a prerequisite for admission"
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