This task describes how requirements changes are managed over time.
Changes might cause you to add, edit, or remove requirements. In order to keep a complete change history, you must
remove requirements by marking them as obsolete in the project, rather than physically deleting the requirements.
Transaction information is captured in the requirement repository for further reference. After the change, it is
necessary to re-assess the traceability, and ensure the validity and consistency across the project.
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