Abstract
Abstract The current engineering design and production management puts an essential requirement on information modeling and manipulation, i.e., the need to represent evolutionary information with engineering and production processes. Such a need requires dealing with so called incomplete and uncertain information, which will be discussed in this paper. The contribution of the paper includes an elaboration of the information soundness (in database). Based on this elaboration the need to represent incomplete and uncertain information is explained. The state of the art of the representation and the manipulation of incomplete and uncertain information in database is then shown in a relational database environment. This will also include the authors’ work. Finally, some ideas on future work are discussed, including an important observation, i.e., the need to study fuzzy probabilistic information.
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