Ple the benefit of the change can be the avoided loss

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ple, the benefit of the change can be the avoided loss in prestige, improved market position, or avoided contract penalties. Implementing approved changes In the next step, approved changes are prioritized by the change control board. Afterward, the requirements changes are assigned to a change project or the next (or any subsequent) system release for imple- mentation. Validating the requirement changes Planning, control of the implementation, and validation of the suc- cessfully applied changes are typically the responsibility of the change manager or of the change control board and may be delegated, of course. 8.7 Summary Requirements management is a core activity of requirements engineering. It’s the aim of this activity to maintain persistent availability of the docu- mented requirements as well as other relevant information over the course of the entire system or product life cycle, to structure this information in a sensible manner (e.g., by means of requirements attributes), and to ensure selective access to this information. The management of require- ments comprises techniques of the following categories: Assigning attributes to requirements: In order to allow for requirements management, properties of requirements are documented by means of requirements attributes. Prioritizing requirements: Requirements are prioritized at different points in time, during different activities, and according to different criteria. Depending on the goal of prioritization and the subject of pri- oritization, different prioritization techniques are to be used. Traceability of requirements: During requirements management, trace- ability information of requirements is recorded, organized, and main- tained so that information about cross references and dependencies between requirements or between requirements and other develop- ment artifacts can be used. Versioning of requirements: Versioning and configuring requirements makes it possible to keep information about specific developmental states of requirements and requirements documents available over the course of the life cycle of the system or the product.
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8.7 Summary 137 Management of requirements changes: Usually, the change control board is responsible for processing change requests. The change control board decides if a change request is approved or rejected and prioritizes it. The board also performs an impact analysis to estimate the impact of the change on all requirements and development artifacts as well as the resources necessary for implementing the change.
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139 9 Tool Support The different activities of requirements engineering should be supported by adequate tools that ideally integrate and continue processing the already existing information. This information could have been generated during requirements engineering (e.g., natural language or model-based require- ments) or could have been used as the basis for requirements (e.g., conver- sation minutes, goal documents, lists of stakeholders). In practice, the most commonly known tools for requirements engineering are tools that support the management of requirements (see chapter 8). This chapter pri-
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