Well as perspective based reading and validation

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well as perspective-based reading and validation through prototypes and checklists. For requirements negotiation, it is necessary to identify conflicts between stakeholders, analyze them, and resolve them in a suitable man- ner. A systematic conflict management supports analysis and resolution of the conflicts that have been identified over the course of requirements val- idation or other requirements engineering activities.
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111 8 Requirements Management Requirements management comprises purposefully assigning attributes to requirements, defining views on requirements, prioritizing requirements, and tracing requirements as well as versioning requirements and managing requirement changes. Requirements management refers to individual requirements as well as complete requirements documents. 8.1 Assigning Attributes to Requirements Information about the requirements must be documented throughout the entire life cycle of a system. This includes, for example, unique identifiers of a requirement, the name of the requirement, the author and sources of the requirement, and the person responsible for the requirement. 8.1.1 Attributes for Natural Language Requirements and Models To document information about requirements, it has proven useful to delineate this information in a structured manner: as attributes. Attributes of a requirement are defined by a unique name, a short description of the contents, and the set of possible values that can be assigned to the attribute. Template-based assignment of attributes to requirements The simplest way to define requirement attributes is by means of a table structure (template). The template defines the relevant information that is to be documented. This information, i.e., the defined attributes (attribute types), can be different for each type of requirement. For exam- ple, the template for functional requirements can be different from the template for quality requirements with respect to the defined attribute types and/or the allowed attribute values.
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112 8 Requirements Management 8.1.2 Attribute Scheme The set of all defined attributes for a class of requirements (e.g., functional requirements, quality requirements) is called an attribute scheme. Attribute schemes are usually tailored to meet the individual project’s needs. Assignment of requirement attributes During the course of the project, the attributes of the requirements are assigned with fitting attribute values. Figure 8-1 shows an exemplary assignment of attributes for a requirement including the attributes “iden- tifier”, “name”, and “requirement description” as well as attributes that allow for documenting the stability of the requirements and its source as well as its author. Figure 8-1 Example of requirement attribute assignment The requirement that is documented on the basis of the simple template shown in figure 8-1 has the code “Req-10” as its unique identifier. It bears the name “Dynamic Traffic Congestion Avoidance” and a description that specifies the subject of this requirement. The stability of this requirement
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