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8.2Views on RequirementsStructuring requirements by means of information models allows for gen-erating specific views on requirements. It can be seen in practice that theamount of requirements and the amount of dependencies among require-ments are evermore increasing. In order to keep the complexity of therequirements manageable for the project staff, it is necessary to selectivelyaccess and thereby filter the requirements depending on the current task.Role-specific definition of viewsViews on requirements are often defined for different roles in thedevelopment 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. Oneparticular view can also be applied to multiple roles.8.2.1Selective Views on the Requirements FoundationA view contains a part of all available requirement information. A view cando the following:Select particular requirements; i.e., not every requirement is containedin a view.
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1168Requirements ManagementMask certain attributes of requirements; i.e., not every attribute of arequirement is contained in a view.Arbitrarily combine both these selection principles; i.e., only a subsetof all available requirements and only a subset of all available attributesare contained in a view.Generating selective viewsFigure 8-2illustrates the generation of three views, represented by a tablethat is defined on the basis of the structure of the attributes. In all threecases, 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 selectedthat “J. Locke” is responsible for and that have a stability of “fixed”. Of allselected requirements, only the attributes “identifier”, “name”, “descrip-tion”, and “author” are being considered.Figure 8-2 Selective views on the requirements Requirements BasisIdentifier NameDescriptionAuthorSourceResponsibleStabilityStatus ContentStatus ValidationX-RefReq-1"Keyboard Input ..."%7KH#6\VWHP#«%J. LockePMP. WagnerfixedconceptunvalidatedReq-3; Req-9Req-2"Voice Input ..."%7KH#6\VWHP#«%E. KurtPMP. Wagnerestablishedconceptin validationReq-5; Req-123Req-3%5HFHLSWLRQ#RI#«%%7KH#6\VWHP#«%H. EscherMaintanenceP. WagnerestablishedideaunvalidatedReq-4; Req-1Req-4%5HPRWH#'LDJQ#«%%7KH#6\VWHP#«%M. BornMaintanenceM. BornvolatileideaunvalidatedReq-47Req-5%,QSXW#RI#PLVFHO#«% %7KH#6\VWHP#«%H. MillerF. GoldsteinH. Millerfixedconceptin validationReq-33Req-6%$FHVVLQJ#UHFR#«% %7KH#6\VWHP#«%J. LockeF. GoldsteinM. Bornfixeddetailed contentvalidatedReq-45; Req-11Req-7%$XWRPDWLF#«%%7KH#6\VWHP#«%M. BornH. LichtM. Bornfixeddetailed contentin correctionReq-11Req-8%'LVSOD\#RI#«%%7KH#6\VWHP#«%H. MillerJ. LockeM. BornvolatileideaunvalidatedReq-11Req-9%,QSXW#RI#PLVFHO#«% %7KH#6\VWHP#«%J. LockeJ. LockeP. Wagnervolatile
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