Several process models are available to describe RE activities [2]. Key activities include requirements elici- tation, prioritization and negotiation. Requirements elic- itation is the process of seeking, capturing and con- solidating requirements from available requirements sources (e.g. stakeholders) [3]. The requirements gath- ered should be prioritized. The priority of a require- ment shows its importance in comparison to others; it also helps decide which requirements to include in a project [3,4]. Furthermore, prioritization supports requirements negotiation which focuses on conflict res- olution by finding a settlement that mostly satisfies all stakeholders [5].