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requirement comparison table
Subject discover when be is a subtopic of describe restrict has definition
functional requirement consistent with project plan4.5 - Types of Requirementswhat the system should do, i.e. the services provided for the users and for other systems A requirement that describes a service provided by a system
implicit requirementa user or tester runs the systemverifiable10.1 - Basic Definitionsthe domain A requirement not stated explicitly in the requirements document
non-functional requirement verifiable by measuring various aspects of the system and seeing if the measurements conform with the requirement4.5 - Types of Requirementsa constraint that must be adhered to during developmentthe freedom of software engineers as they make design decisions because it limits what resources can be used and sets bounds on aspects of the software's qualityA requirement that constrains design of a system, but does not describe a service that the system is to provide
realistic requirement verifiable4.8 - Reviewing Requirementsthe domain A requirement that the development team has the expertise and technology to implement on the required platform within the budget and time available

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