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A requirements engineering artifact is valid relative to the stakeholders ofthe system-to-be if they agree on the content of that artifact. Checkingrelative validity involves a discussion between the stakeholders and therequirements engineer. This paper proposes (i) a language for therepresentation of information exchanged in a discussion about the relativevalidity of an artifact; (ii) the acceptability condition, which, when itverifies in a discussion captured in the proposed language, signals that therelative validity holds for the discussed artifact and for the participants inthe discussion; and (iii) reasoning procedures to automatically check theacceptability condition in a discussions captured by the proposed language.

Towards a Theory of Requirements Elicitation: Acceptability Condition for the Relative Validity of Requirements