Discussion of the identified flaws in quality during

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Discussion of the identified flaws in quality during a group session The goal of a walk-through of requirements is to identify quality flaws within requirements by means of a shared process and to gain a shared understanding of the requirements between all the people involved. To prepare for a walk-through, the requirements to be validated are handed out to all participants and inspected. During the walk-through session, the participants discuss the requirements to be validated step-by-step, under guidance of the moderator/reader. Usually, the author of a requirement is the one who introduces the requirement to all other participants. This way, the authors have the opportunity to give additional information to the group along with the actual requirement (e.g., alternative require- ments, decisions, and rationale for decisions). A minute-taker documents the flaws in quality that have been identified during the session.
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100 7 Requirements Validation and Negotiation 7.5.4 Perspective-Based Reading Check requirements from a defined perspective. Perspective-based reading is a technique for requirements validation in which requirements are checked by adopting different perspectives [Basili et al. 1996] . Typically, perspective-based reading is applied in conjunction with other review techniques (e.g., during inspections or walk-throughs). Focusing on particular perspectives when reading a document verifiably leads to improved results during requirements validation. Possible per- spectives for validation, for instance, emerge from the different addressees of a requirement [Shull et al. 2000] : User/customer perspective: The requirements are checked from the per- spective of the customer or the user to determine whether they describe the desired functions and qualities of the system. Software architect perspective: The requirements are checked from the perspective of the software architect to ascertain if they contain all nec- essary information for architectural design (e.g., if all relevant per- formance properties have been described). Tester perspective: The requirements are checked from the perspective of the tester to establish whether they contain the information neces- sary to derive test cases from the requirements. Perspective quality aspects The three quality aspects (see section 7.3 ) also describe three possible per- spectives for requirements validation: Content perspective: With the content perspective, the auditor verifies the content of requirements and focuses on the quality of the content of the documented requirement. Documentation perspective: With the documentation perspective, the auditor ensures that all documentation guidelines for requirements and requirements documents have been met. Agreement perspective: With the agreement perspective, the auditor checks if all stakeholders agree on a requirement, i.e., if the require- ments are agreed upon and conflicts have been resolved.
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