The requirements elicitation of a system is a complex task. The different viewpoints and the need for negotiation make this stage of the software development process risky and susceptible to failures. The traditional elicitation approach based on interviews and questionnaires do not help. This paper proposes an approach founded on collective knowledge to progressively build the system requirements from a narrative of use stories to the definition of use cases. The proposed solution consists of a knowledge model based on stories about the system, a collective construction method, and a tool to support interaction.
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