Summary form only given. Scenario-based approaches are attractingmore and more interest in requirements engineering research andpractice. The research literature offers an increasing number ofscenario-related methods, models and notations which highlight theconsideration of concrete system descriptions from a usage-orientedperspective, prior to abstract conceptual modelling of function, dataand behavior. Scenario use is also becoming a pervasive phenomenon inindustrial practice, but comprehensive and expressive studies on thepractical relevance of the techniques proposed by research are stillrare. The European ESPRIT project CREWS (Cooperative RequirementsEngineering With Scenarios) aims at a deeper understanding of thediversity of scenarios, in order to help improve methodological and toolsupport for scenario-based requirements engineering. The authorsconsider the two-pronged strategy being followed to gain thisunderstanding
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