Formal factors also contribute to completeness Graphs diagrams and tables

Formal factors also contribute to completeness graphs

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Formal factors also contribute to completeness. Graphs, diagrams, and tables should be appropriately labeled. Another important aspect is that consistent reference and index directories must exist. Also, definitions and norm reference that denote specific terms must be included in any requirements document. The comprehensiveness of a requirements docu- ment is a challenge during requirements engineering. Often, a compro- mise must be found between the time resources available and the com- pleteness of the requirements documents. 4.5.5 Traceability Relationship to other development documents An important quality criterion is traceability of relationships between requirements documents and other documents (e.g., business process model, test plans, or design plans). These documents could have been cre- ated in previous development phases, in subsequent development phases, or concurrently with the requirements documents. Among other things, traceability supports change management (see section 8.4 ). 4.6 Quality Criteria for Requirements Quality criteria for reader acceptance The quality criteria defined in IEEE standard 830 [IEEE Std. 830-1998] can be applied to individual requirements as well as entire requirements documents. In addition to the formal criteria, further quality criteria for individual requirements can be stipulated and are meant to increase the readers’ acceptance of the specification. The formal criteria according to [IEEE Std. 830-1998] as well as criteria that increase the readers’ accept- ance of the requirements are briefly explained in the following list: Agreed: A requirement is agreed upon if it is correct in the opinion of all stakeholders and all stakeholders accept it as valid. Ranked: [IEEE Std. 830-1998] When the complexity or comprehensive- ness of a system reaches a certain threshold, it is important to rate the requirements, for example, according to their importance, legal obliga- tion, or priority. This is especially the case if not all functions of a system can be implemented right away in a particular system release. In that case, the stakeholders must rate the requirements.
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44 4 Documenting Requirements Unambiguous: [IEEE Std. 830-1998] A requirement that is unambigu- ously documented can be understood in only one way. It must not be possible to interpret the requirement in a different way. All readers of the requirement must arrive at the same understanding of the require- ment. Valid and up-to-date: A documented requirement must represent the facts and conditions of the system context in a way that it is valid with regard to the actualities of the system context. These actualities may be the different stakeholders’ ideas, relevant standards, or interfaces to external systems. Correct: [IEEE Std. 830-1998] A requirement is correct if it adequately represents the idea of the stakeholder. This also means that the require- ment may not express more than what the stakeholder was trying to say. In order to verify that, it is necessary for the stakeholders to be able to read and understand the requirements documentation. Therefore,
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