Agreement do all stakeholders concur with the

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Agreement: Do all stakeholders concur with the documented require- ments and have all known conflicts been resolved? Three quality aspects Each of the three goals implies an individual approach that focuses on spe- cific aspects of the quality of the requirements. Therefore, the following three quality aspects have been defined: Quality aspect “content” Quality aspect “documentation” Quality aspect “agreement” A requirement should be approved for further development activities only if all three quality aspects have been checked. The quality aspects are described in detail in the following sections and made concrete through different fine-grained quality criteria (with no claim of com- pleteness). 7.3.1 Quality Aspect “Content” The quality aspect “content” refers to the validation of requirements with respect to errors in the content. Errors in requirements with regard to con- tent negatively influence the subsequent development activities and cause these activities to be based upon erroneous information. Test criteria of the quality aspect “content” Errors in requirements with regard to content are present when spe- cific quality criteria for requirements (see section 4.6) or for requirements documents (see section 4.5 ) are violated. The validation of requirements with regard to the quality aspect “content” is successful once requirements
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92 7 Requirements Validation and Negotiation validation has been applied to the following error types and no significant shortcomings have been detected: Completeness (set of all requirements): Have all relevant requirements for the system to be developed (for the next system release) been docu- mented? Completeness (individual requirements): Does each requirement con- tain all necessary information? Traceability: Have all relevant traceability relations been defined (e.g., to relevant requirements sources)? Correctness/adequacy: Do the requirements accurately reflect the wishes and needs of the stakeholders? Consistency: Is it possible to implement all defined requirements for the system to be developed jointly? Are there no contradictions? No premature design decisions: Are there any forestalled design decisions present in the requirements not induced by constraints (e.g., constraints that specifiy a specific client-server architecture to be used)? Verifiability: Is it possible to define acceptance and test criteria based on the requirements? Have the criteria been defined? Necessity: Does every requirement contribute to the fulfillment of the goals defined? 7.3.2 Quality Aspect “Documentation” The quality aspect “documentation” deals with checking requirements with respect to flaws in their documentation or violations of the documen- tation guidelines that are in effect, such as understandability of the docu- mentation formats and the consideration of organizational or project- specific guidelines regarding the documentation of requirements but also the structure of the requirements documents.
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