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It differs from the other proposals particularly
in that it is standardized and explicitly supported by tools. To support
requirement modeling, SysML has a separate diagram type that shows requirements
and their relationships to other model elements ( Figure 4.4 ).
4.3.1 Requirement
FIGURE 4-3
SysML diagrams.
4.3 The Requirement Diagram
bdd [package] SysML book [SysML diagrams]
?«domain?»
SysML
Diagram
?«domain?»
Structure
diagram
?«domain?»
Parametric
diagram
?«domain?»
Behavior
diagram
?«domain?»
Block definition
diagram
?«domain?»
Activity
diagram
?«domain?»
Sequence
diagram
?«domain?»
State machine
diagram
?«domain?»
Use case
diagram
New
Renamed
& extended
?«domain?»
Package
diagram
?«domain?»
Internal block
diagram
Renamed
& extended
?«domain?»
Requirement
diagram
New
Extended
Defi nition
A requirement describes one or more properties or behaviors of a system
that always have to be met.
It is a stereotype ?«requirement?» of the UML element class.
Requirements describe a contract between the principal and all those who create
the system design and implement the system.


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