Modern information systems have to support a variety of different device
types like desktop computers, smartphones, or tablets. Furthermore, it is
important to enable users to use device types that fit their needs or are
suited for the tasks at hand, e.g., allowing them to use multiple devices in
parallel or sequentially by switching from one device to another. Such
cross-device interactions must be taken into account already during
requirements analysis to ensure that they are properly addressed in later
phases of development. Unfortunately, current requirements modeling
techniques do not provide adequate techniques to model cross-device systems.
In this paper, we present an extended form of use case diagrams able to model
such systems. Using our approach it is possible to specify which device types
can be used when performing a certain use case and what kinds of cross-device
interactions are supported. Based on this, we show how this information can
be refined by integrating extended use case diagrams with our existing
approach to model cross-device interactions in process diagrams. Thereby, we
explain how requirements can be modeled visually in a model-based development
process for cross-device systems.
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