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can choose any character string. Moreover, each requirement comes with a piece
of text??”also an arbitrary character string??”that describes the requirement. It can
optionally contain a reference to external sources, e.g., a requirements management
tool. The requirement element is then only a reference in the SysML model to the
external source.
Requirements are usually described in text form. Modeling with SysML means
nothing else but storing the text in a standardized format and representing the
text blocks in rectangles in the diagram to visualize their relationships. In turn,
you can generate pure text documents from SysML requirements. They are a nonstandardized
view on the SysML requirement model.
Figure 2.7 shows another model element connected with the requirement by
a dashed line. This is a rationale . You can use it to document the Why?, which can
be very valuable information. If the reader cannot answer the Why?, then this can
have a blocking and stifl ing effect on his further work [56].
FIGURE 2-7
Requirement for enclosure size.


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