82 views on requirements structuring requirements by

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8.2 Views on Requirements Structuring requirements by means of information models allows for gen- erating specific views on requirements. It can be seen in practice that the amount of requirements and the amount of dependencies among require- ments are evermore increasing. In order to keep the complexity of the requirements manageable for the project staff, it is necessary to selectively access and thereby filter the requirements depending on the current task. Role-specific definition of views Views on requirements are often defined for different roles in the development process. Examples include views for the architect, the pro- grammer, the project manager, and the tester. It is common to define mul- tiple views for a role in order to support the sub-activities of each role. One particular view can also be applied to multiple roles. 8.2.1 Selective Views on the Requirements Foundation A view contains a part of all available requirement information. A view can do the following: Select particular requirements; i.e., not every requirement is contained in a view.
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116 8 Requirements Management Mask certain attributes of requirements; i.e., not every attribute of a requirement is contained in a view. Arbitrarily combine both these selection principles; i.e., only a subset of all available requirements and only a subset of all available attributes are contained in a view. Generating selective views Figure 8-2 illustrates the generation of three views, represented by a table that is defined on the basis of the structure of the attributes. In all three cases, the views are created by selecting attribute types as well as by deter- mining the attributes that must be available. The definition of the first view ( n ), for example, determines that only those requirements are selected that “J. Locke” is responsible for and that have a stability of “fixed”. Of all selected requirements, only the attributes “identifier”, “name”, “descrip- tion”, and “author” are being considered. Figure 8-2 Selective views on the requirements Requirements Basis Identifier Name Description Author Source Responsible Stability Status Content Status Validation X-Ref Req-1 "Keyboard Input ..." %7KH#6\VWHP#«% J. Locke PM P. Wagner fixed concept unvalidated Req-3; Req-9 Req-2 "Voice Input ..." %7KH#6\VWHP#«% E. Kurt PM P. Wagner established concept in validation Req-5; Req-123 Req-3 %5HFHLSWLRQ#RI#«% %7KH#6\VWHP#«% H. Escher Maintanence P. Wagner established idea unvalidated Req-4; Req-1 Req-4 %5HPRWH#'LDJQ#«% %7KH#6\VWHP#«% M. Born Maintanence M. Born volatile idea unvalidated Req-47 Req-5 %,QSXW#RI#PLVFHO#«% %7KH#6\VWHP#«% H. Miller F. Goldstein H. Miller fixed concept in validation Req-33 Req-6 %$FHVVLQJ#UHFR#«% %7KH#6\VWHP#«% J. Locke F. Goldstein M. Born fixed detailed content validated Req-45; Req-11 Req-7 %$XWRPDWLF#«% %7KH#6\VWHP#«% M. Born H. Licht M. Born fixed detailed content in correction Req-11 Req-8 %'LVSOD\#RI#«% %7KH#6\VWHP#«% H. Miller J. Locke M. Born volatile idea unvalidated Req-11 Req-9 %,QSXW#RI#PLVFHO#«% %7KH#6\VWHP#«% J. Locke J. Locke P. Wagner volatile
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