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In software development,
use cases are often realized by flow controllers in the design.
3.3 The Class Diagram
class Container
Ship
cargo *
*
Container
delivery item
Shipment
FIGURE 3-16
Example for a dependency.
class Flow controller
StartCarUsageCtrl Customer
Defi nition
A dependency is a relationship between two elements, which describes that
one element needs the other element for its specification or implementation.
In contrast to an association, a dependency can be defined not only between
classes, but also between almost any model elements. This is the most common
use in class modeling.
Figure 3.16 shows a dependency between a fl ow controller 8 and the class
customer .
158 CHAPTER 3 UML??”Unifi ed Modeling Language
The fi eld of software development uses the dependency relationship very
intensely, while it is used rather scarcely for block modeling in SysML.
A dependency is denoted as a dashed arrow without additional notes. There
are no role names, nor are there multiplicities, as in associations.
3.


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