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What is Grey System (GS)

Encyclopedia of Information Science and Technology, Fifth Edition
A system which lacks information, such as structure message, operation mechanism and behaviour document. Usually, on the grounds of existing grey relations and elements one can identify where “grey” means poor, incomplete, uncertain, etc.
Published in Chapter:
Use of Grey Numbers for Evaluating a System's Performance Under Fuzzy Conditions
Michael Voskoglou (Graduate Technological Educational Institute of Western Greece, Greece)
Copyright: © 2021 |Pages: 17
DOI: 10.4018/978-1-7998-3479-3.ch023
In the present research, a method using Grey Numbers as tools is developed for assessing a system's mean performance, which is useful when utilizing qualitative grades and not numerical scores for this purpose. Although this new method is proved to be equivalent with an analogous method using Triangular Fuzzy Numbers as tools developed in an earlier work, it reduces the required computational burden, since it requires the calculation of two components only (instead of three in the case of the Triangular Fuzzy Numbers) for obtaining the mean value of the Grey Numbers involved. Examples are also presented on student and athlete assessment illustrating the new method and showing that the system's quality performance, calculated by the traditional GPA index, may lead to different assessment conclusions.
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