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Several requirements relationships are specified that enable the modeler to relate requirements to other requirements as well as to other model elements.

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A basic Requirement is an AbstractRequirement
Source
OMG Systems Modeling Language (SysML) 1.6
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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INFO
SysML keywords
Requirement
SysML Requirements Diagram
Satisfy
DeriveReqt
Copy
Verify
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Several requirements relationships are specified that enable the modeler to relate requirements to other requirements as well as to other model elements.
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These include relationships for defining a requirements hierarchy, deriving requirements, satisfying requirements, verifying requirements, and refining requirements.
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A requirement specifies a capability or condition that must (or should) be satisfied. A requirement may specify a function that a system must perform or a performance condition a system must achieve.
A requirement specifies a capability or condition that must (or should) be satisfied.
A requirement may specify a function that a system must perform or a performance condition that a system must satisfy.
SysML provides modeling constructs to represent text-based requirements and relate them to other modeling elements.
The requirements diagram described in this clause can depict the requirements in graphical, tabular, or tree structure format. A requirement can also appear on other diagrams to show its relationship to other modeling elements.
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These include relationships for defining a requirements hierarchy, deriving requirements, satisfying requirements, verifying requirements, and refining requirements.
A composite requirement can contain subrequirements in terms of a requirements hierarchy, specified using the UML namespace containment mechanism. This relationship enables a complex requirement to be decomposed into its containing child requirements.
A composite requirement may state that the system shall do A and B and C, which can be decomposed into the child requirements that the system shall do A, the system shall do B, and the system shall do C
An entire specification can be decomposed into children requirements, which can be further decomposed into their children to define the requirements hierarchy.
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