requirements - meaning and definition. What is requirements
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What (who) is requirements - definition

SET OF CRITERIA TO WHICH A PARTICULAR DESIGN, PRODUCT OR PROCESS MUST CONFORM
Requirements; Software requirement; Required; BUFQI; Customer requirement

requirements         
<programming> The first stage of software development which defines what the potential users want the system to do. In modern methods these requirements should be testable, and will usually be traceable in later development stages. A common feature of nearly all software is that the requirements change during its lifetime. See software life-cycle. (1995-11-11)
Software requirements specification         
A SET OF FUNCTIONAL AND NON-FUNCTIONAL REQUIREMENTS THAT A PIECE OF DESIGNED SOFTWARE NEEDS TO FULFIL, MAY INCLUDE A SET OF USE CASES
Requirements specification; IEEE 830; Req spec; Requirements specifications; Software Requirements Specification
A SOFTWARE REQUIREMENTS SPECIFICATION (SRS) is a description of a software system to be developed. It is modeled after business requirements specification (CONOPS).
Required         
·Impf & ·p.p. of Require.

Wikipedia

Requirement

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.

Examples of use of requirements
1. Physical requirements Aside from these psychological and ethical issues, experts can‘t agree on physical requirements.
2. "Our ministry will toughen requirements for the Russia side," he said, without elaborating on what the new requirements would be.
3. It‘s about equal treatment of all employees, all of whom have the same service requirements, the same contractual requirements.
4. "A lot of those requirements are genuine trade requirements, but others have to do with political steps.
5. Requirements for industry and government are different, with stringent requirements for preservation of federal and presidential records.