830 1998 traceability ieee std 830 1998 451

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[IEEE Std. 830-1998] Traceability [IEEE Std. 830-1998] 4.5.1 Unambiguity and Consistency Quality of individual requirements is a prerequisite. Requirements documents can be consistent and unambiguous only when the individual requirements are consistent and unambiguous. In addition, it must be guaranteed that individual requirements do not contradict one another. To achieve this, it is advisable to make use of conceptual models
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42 4 Documenting Requirements (see chapter 6 ). Another aspect of unambiguity pertains to the unique identification of a requirements document or a requirement among the set of all requirements documents or requirements in a development project (see section 8.5 ). 4.5.2 Clear Structure Allows for selective reading In order to guarantee that the requirements document is readable by any stakeholder, it should be appropriately comprehensive and clearly struc- tured. Unfortunately, no clear-cut suggestions can be made regarding the appropriate comprehensiveness of a requirements document. A very com- prehensive requirements document with a good structure can be just as appropriate as a less comprehensive document because a clear structure will allow the reader to skip parts that are not relevant to him. An unstruc- tured or badly structured requirements document of the same high level of comprehensiveness would not be appropriate because the document must be read in its entirety in order for a stakeholder to be able to identify parts that are relevant to her. A good starting point is the standard struc- tures described in section 4.3.1 . 4.5.3 Modifiability and Extendibility Content and structure should support changeability. Requirements documents must be easy to extend. There are always requirements that are changed, altered, added, or removed as a project progresses. As a result, the structure of requirements documents should be easy to modify and extend. The requirements documents of a project should be subject to the project’s version control management. 4.5.4 Completeness Two types of completeness in requirements documents Requirements documents must be complete, i.e., they must contain all rel- evant requirements (and required additional information), and each requirement must be documented completely . 3 All possible inputs, influ- ential factors, and required reactions of the system must be described for each desired system function. This comprises describing error and excep- tion cases in particular. Also, quality requirements, such as requirements 3. Strictly speaking, this statement holds true only for the requirements document of the next system release (see section 8.5.3 ).
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4.6 Quality Criteria for Requirements 43 pertaining to reaction times or availability and usability of the system, must be noted. Evidence, reference, and sources are formal necessities.
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