108 7 requirements validation and negotiation

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108 7 Requirements Validation and Negotiation Decision matrix In the conflict resolution technique decision matrix , a table is created that contains solution alternatives in the columns and all relevant decision criteria in the rows. The decision criteria can be identified by means of the technique “consider-all-facts”. For each combination of criterion and solu- tion alternative, an assessment is made, for instance by means of a point- scale ranging from irrelevant (0 points) to relevant (10 points ) . Table 7-1 shows a decision matrix. Table 7-1 Decision matrix In order to find a solution, the sums of the columns are calculated; i.e., the assessments of the criteria of each solution alternative are summed up. The solution alternative with the highest score is accepted as the decision. In the example shown in table 7-1, this would be solution alternative 1. 7.6.4 Documentation of the Conflict Resolution Risks of missing conflict documentation Conflicts cannot be avoided during requirements engineering. A resolu- tion to a conflict must always be traceably documented. If a conflict reso- lution is not properly documented, the following threats (among others) to the project may arise: Handling conflicts repeatedly: A certain conflict can arise a second time during the requirements engineering process. Without proper docu- mentation of the conflict resolution, the conflict must be analyzed and resolved anew. This causes additional effort and can potentially lead to additional conflicts or abrogate previous resolutions. Inappropriate conflict resolution: During the requirements engineering process, the resolution of a conflict can turn out to be wrong or unsuit- able. In this case, the conflict must be investigated and resolved anew. Without proper documentation, relevant information that has been considered during the initial analysis and resolution can be overlooked and the new conflict resolution can once again lead to false results. Solution alternative 1 Solution alternative 2 Solution alternative 3 Criterion 1 3 6 2 Criterion 2 5 4 10 Criterion 3 10 3 5 Sum 18 13 17
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7.7 Summary 109 In both cases, proper documentation of the conflict and its resolution sup- ports the requirements engineering process and ensures that relevant information already known can be considered. 7.7 Summary The quality of the elicited and documented requirements must be assured during requirements engineering so that it can be guaranteed that the requirements meet the desires and ideas of the stakeholders adequately. Therefore, it is necessary to validate the requirements with regard to the quality of their content, their documentation, and their agreement with respect to the different stakeholders. There are different techniques that can be selected and purposively combined for requirements validation, depending on the project peculiarities and project goals. Among the most common validation techniques for requirements are the different types of requirements reviews (e.g., commenting, inspection, walk-through) as
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