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PREview (<u>Pr</u>ocess and <u>Re</u>quirements <u>View</u>points) is a requirements method which focuses on the early stage of Requirements Engineering: discovering and documenting requirements. PREview uses a Viewpoint-Oriented Approach to enable the conversion of top-level goals (“concerns”) into requirements and constraints Sawyer, P., Sommerville, I. and Viller, S. (1996). PREview: Tackling the Real Concerns of Requirements Engineering. Cooperative Systems Engineering Group, Technical Reports 1996. “Preview aims to improve the quality of requirements specification by providing a framework which can support both requirements elicitation and the structuring of the requirements documentSommerville, and I., Sawyer P. (1997). Viewpoints: principles, problems and a practical approach to requirements engineering, Annals of Software Engineering 3 pp.101-130..”


PREview focuses on viewpoints for requirements engineering of computer-based systems but the viewpoint-concept is also used in various other areas of expertise. In communications, the ODP (Open Distributed Processing) Reference Model defines viewpoints from which a system can be specifiedFarooqui, K., Logrippo, L., and de Meer, J. (1995). The ISO Reference Model for Open Distributed Processing: an Introduction. Computer Networks and ISDN Systems, 27(8), pp. 1215-1229.. In......
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