engineering role

May 15th, 2015
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The Engineering Roles of Requirements and SpecificationElisabeth A. Strunk1, Carlo A. Furia2, Matteo Rossi2, John C. Knight1, Dino Mandrioli21University of Virginia151 Engineer's WayCharlottesville, VA 22904-4740{strunk, knight }@cs.virginia.edu2Politecnico di MilanoVia Ponzio 34/5,20133, Milano, Italy{furia, mandrioli, rossi}@elet.polimi.itAbstractThe distinction between requirements and specification is often confused in practice. Thisobstructs the system validation process, because it is unclear what exactly should be validated,and against what it should be validated. The reference model of Gunter et al. addresses thisdifficulty by providing a framework within which requirements can be distinguished fromspecification. It separates world phenomena from machine phenomena. However, it does notexplain how the characterization can be used to help assure system validity.In this paper, we enhance the reference model to account for certain key elements that arenecessary to expose and clarify the distinction and the link between requirements andspecification. We use the enhanced version to present a more refined picture of validity, wherevalidation has two steps that can be undertaken separately. We use this picture to questionwhether the what the system will do, not how it will do it paradigm is useful in describing howto construct a specification, and propose an alternative. Finally, we present the requirements andspecification for an illustrat

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