Requirements:
General requirements to the system.
Use cases [object fl ow]:
Use cases with object fl ow in fl ow
descriptions.
Motivation/description
Why? Studying the data incoming and outgoing to/from your fl ow steps sharpens
your description and supplies important information for the design, e.g., for interface
descriptions. The object fl ow functions as a link between the dynamic and static
models and ensures mutual consistency.
What? Model the incoming and outgoing data of each of the use case steps and their
relationships.
How? The actions of the activity are fi tted with pins that describe the incoming and
outgoing data.
Where? The object fl ow adds a degree of details to the model, which can be used for
simulations and automated consistency checks.
Guiding questions
?– What data is required by a use case step?
?– What data is created or modifi ed by a use case step?
SysML elements
Activity diagram, activity, activity parameters, action, pin, control node (e.g., initial
node, decision).
Model object
flows
Use cases
[detailed]
Requirements
Use cases
[object flow]
97 2.
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