The situations within which Information Systems Development in general, and Requirements Engineering in particular are positioned, can be regarded as design situations. We subscribe to the view that understanding the problem amounts to solving it. The implication of this is that RE involves a continuous cycle of problem generationconjecture -evaluation. This paper is concerned with the evaluation of designs for a given set of requirements. Our approach is based on a framework that demands a reflective stance whereby the issues, positions and arguments are clearly visible to all participants and a rationale behind the design decisions taken is kept for future examination. Within this context, we are concerned with both the reasoning for the planning of designing the target artefact, and the alternative specifications in the design 'product' themselves.
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