Grey Systems

Aims & Scope

Grey Systems: Theory and Application (GS) is devoted to the international advancement of the theory and application of grey systems and uncertainty analysis.

It seeks to foster professional exchanges between scientists and practitioners who are interested in the foundations and applications of grey systems and uncertainty analysis.

Through the pioneering work completed over recent years, uncertainty-based techniques such as grey systems theory, fuzzy mathematics and rough set have become powerful tools in addressing systems with uncertain information.

Articles published by the journal will explore the theory and applications of grey systems as well as contributions on hybrid approaches combining grey systems with other uncertainty theories, in order to tackle uncertain information more effectively and efficiently.

The journal aims to provide state-of-the-art information and case studies on new developments and trends in grey system theory and its potential application to solve practical problems

View Aims & Scope

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Metrics & Ranking

Impact Factor

Year	Value
2025	4.4
2024	3.20

SJR (SCImago Journal Rank)

Year	Value
2024	0.693

Quartile

Year	Value
2024	Q2

h-index

Year	Value
2024	32

Journal Rank

Year	Value
2024	8210

Journal Citation Indicator

Year	Value
2024	474

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Abstracting & Indexing

Journal is indexed in leading academic databases, ensuring global visibility and accessibility of our peer-reviewed research.

• Scopus
• Google Scholar
• Web of Science

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Subjects & Keywords

Journal’s research areas, covering key disciplines and specialized sub-topics in Computer Science, Engineering and Mathematics, designed to support cutting-edge academic discovery.

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Most Cited Articles

The Most Cited Articles section features the journal's most impactful research, based on citation counts. These articles have been referenced frequently by other researchers, indicating their significant contribution to their respective fields.

• A brief introduction to grey systems theory

  Citation: 189

  Authors: Sifeng, Jeffrey, Yingjie

• New progress of Grey System Theory in the new millennium

  Citation: 149

  Authors: Sifeng, Yingjie, Naiming, Jeffrey

• Novel models of grey relational analysis based on visual angle of similarity and nearness

  Citation: 125

  Authors: Si‐feng, Nai‐ming, Jeffrey

• General grey numbers and their operations

  Citation: 95

  Authors: Sifeng, Zhigeng, Yingjie, Jeffrey

• A summary on the research of GRA models

  Citation: 85

  Authors: Sifeng, Yingjie, Ying, Naiming

• Evaluation of outpatient satisfaction and service quality of Pakistani healthcare projects

  Citation: 67

  Authors: Saad Ahmed, Sifeng

• Green supplier selection based on IFS and GRA

  Citation: 58

  Authors: Ozkan, Erkan, Serkan

• Application of grey theory approach to evaluation of organizational vision

  Citation: 57

  Authors: Fariborz, Mahdi, Ebrahim

• Coordination and competition in two-echelon supply chain using grey revenue-sharing contracts

  Citation: 53

  Authors: Ayad, Mohammad, Mohammad Reza, Naiming, Mohammad Hossein

• Research on a novel fractional GM(<i>α</i>, <i>n</i>) model and its applications

  Citation: 51

  Authors: Wenqing, Xin, Yong, Yuanyuan, Bo

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