Overview of system functions use case diagram a use

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Overview of system functions Use case diagram: A use case diagram allows you to gain a quick over- view of the functionalities of the specified system. A use case describes which functions are offered to the user by the system and how these functions relate to other external interacting entities. However, use cases do not describe the responsibilities that the functions have in detail (see section 6.3 ). Structural data modeling and structuring of terms Class diagram: Among other things, class diagrams are used in require- ments engineering to document requirements with regard to the static structure of data, to document static-structural dependencies between the system and the system context, or to document complex domain terms in a structured manner (see section 6.5.2 ). Sequence modeling Activity diagram: Using activity diagrams, business processes, or sequence-oriented dependencies of the system in regard to processes within the system context can be documented. Activity diagrams are also well suited to model the sequential character of use cases or to model a detailed specification of the interaction of functions that proc- ess data (see section 6.6.3 ). Event-driven behavior State diagram: State diagrams are used in requirements engineering to document event-driven behavior of a system. The focus of this type of model is on the individual states the system can be in, events and their respective conditions that trigger a state transition, and effects of the system in its environment. 4.2.4 Hybrid Requirements Documents Combined use of documentation types Requirements documents first and foremost contain requirements. In addition, in many situations it is sensible to document decisions, impor- tant explanations, and other relevant information as well. Depending on the target audience of the document, the perspective on the system, and the documented knowledge, suitable documentation types are selected. Typically, documents contain a combination of natural language and con- ceptual models. The combination allows the disadvantages of both docu- mentation types to be decreased by means of the strengths of the other documentation type, and combining documentation types exploits the
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4.3 Document Structures 37 advantages of both. For instance, models can be amended or comple- mented by natural language comments and natural language requirements and natural language glossaries can be summarized and their dependen- cies can be depicted clearly by making use of models. 4.3 Document Structures Influence of the requirements on satisfaction Requirements documents contain a magnitude of different information. These must be well structured for the reader. In order to do that, one can make use of standardized document structures or individually define a custom document structure.
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