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Their decision problems are identified in the RE process and the software engineering process. They focus on a broader context and include other aspects, such as maturity of organisations and availability of information. The two perspectives are not mutually exclusive, but the focus and order of importance are different (Ngo-The & Ruhe, 2005). Our perspective is an activity-centric perspective, since we primarily focus on decision-making activities of requirements engineers and the problems and difficulties they experience.

Similar to requirements elicitation, the quality of requirements analysis affects the quality of RE decision-making. The most important success factor for requirements analysis is probably the experience and knowledge of those who carry out the analysis. Another reflection is that it would be interesting to investigate to what extent different types of information need to be stored together with and related to specific requirements in order to support RE decision-making. It would also be interesting to see if current RE tools afford storing of different kind of information and if the relations between information and requirements are represented in an efficient and effective manner, so that the RE decision-makers can interpret the relations correctly and easily.

This categorisation shows that not all aspects of RE are supported by tools. For example, there is no requirements negotiation tool or requirements validation tool. Perhaps such tools exist, though not explicitly part of the categorisation of RE tools, which indicates that there is room for improvement in this area. A problem with the RE tool categorisation of INCOSE is that the functionality of a certain RE tool can be broad and the tool can be classified in several RE tool categories (Matulevičius, 2005).

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