Journal profile · MATHEMATICS, INTERDISCIPLINARY APPLICATIONS
Grey Systems-Theory and Application
ISSN 2043-9377 · eISSN 2043-9385 · EMERALD GROUP PUBLISHING LTD · ENGLAND
Grey Systems-Theory and Application: CAS Zone 3 · Engineering (2025 upgraded edition); impact factor 4.57; subscription journal; 50 articles in 2025; indexed in SCIE and Scopus.
Scope
Aims, scope and focus
Grey Systems-Theory and Application is published by EMERALD GROUP PUBLISHING LTD and is in Zone 3 of Engineering in the CAS Journal Ranking (2025 upgraded edition). By OpenAlex counts of its recent articles, its largest topics are Grey System Theory Applications, Multi-Criteria Decision Making and Energy Load and Power Forecasting, together about 60% of its articles. Its main subfields are Management Science and Operations Research. (generated from OpenAlex topic counts and CAS ranking data)
Research area (LetPub): MATHEMATICS, INTERDISCIPLINARY APPLICATIONS
Main research topics OpenAlex counts of recent articles; shares are approximate
- Grey System Theory ApplicationsDecision Sciences40.1%
- Multi-Criteria Decision MakingDecision Sciences11.8%
- Energy Load and Power ForecastingEngineering8.1%
- Forecasting Techniques and ApplicationsDecision Sciences4.4%
- Optimization and Mathematical ProgrammingEngineering4%
- Rough Sets and Fuzzy LogicComputer Science3.4%
- Diverse Interdisciplinary Research InnovationsDecision Sciences3.3%
- Energy, Environment, Economic GrowthEconomics, Econometrics and Finance3.1%
Rankings & indexing
CAS ranking and database indexing
CAS Journal Ranking
CAS Journal Ranking, upgraded edition (March 2025)Engineering Zone 3
| Level | Category | Zone |
|---|---|---|
| Major | Engineering | Zone 3 |
| Minor | Mathematics, Interdisciplinary Applications | Zone 3 |
Top journal: noReview journal: no
CAS Xinrui Journal Ranking (March 2026)Engineering Zone 2
| Level | Category | Zone |
|---|---|---|
| Major | Engineering | Zone 2 |
| Minor | Mathematics, Interdisciplinary Applications | Zone 2 |
Top journal: noReview journal: not marked
CAS Journal Ranking, previous upgraded edition (December 2023)Engineering Zone 3
| Level | Category | Zone |
|---|---|---|
| Major | Engineering | Zone 3 |
| Minor | Mathematics, Interdisciplinary Applications | Zone 3 |
Top journal: noReview journal: no
Database indexing
SCIEScopusLetPub
International journal early-warning lists: not listed in any editionLetPub
Editions, and major and minor categories, are shown separately and never merged into one zone; check which edition your institution uses before you submit or report.
Metrics
Impact metrics and publication volume
Impact
- Impact factor
- 4.57LetPub ·
- CiteScore 2026-06
- 6.3LetPub ·
- SJR 2026-06
- 0.56LetPub ·
- SNIP 2026-06
- 0.85LetPub ·
- h-index
- 39OpenAlex ·
- i10-index
- 251OpenAlex ·
- 2-year mean citedness
- 3.56OpenAlex ·
- Self-citation rate
- 30.4%LetPub ·
- Share of gold OA articles
- 0%LetPub ·
Volume
- Articles per year
- 47LetPub ·
Articles by year OpenAlex count · 598 in total · the current year is incomplete
| Year | Articles | Open access | Citations |
|---|---|---|---|
| 2026 | 29 | 2 | 15 |
| 2025 | 50 | 2 | 172 |
| 2024 | 29 | 1 | 197 |
| 2023 | 43 | 3 | 491 |
| 2022 | 27 | 1 | 413 |
| 2021 | 35 | 0 | 396 |
Sources count differently and were observed at different times, so each source's own value is kept; "publisher" marks figures from the journal's website.
Fees & open access
APC and open-access policy
Subscription journalLetPub
A subscription journal: articles are read by subscription or purchase, and authors usually pay no publication charge.
No source has fee information yet; check the journal's website.
The journal's website is authoritative for fees; sources were observed at different times and each keeps its own value, without averaging.
Profile
Publication details and official links
- Publisher
- EMERALD GROUP PUBLISHING LTD
- Country or region
- ENGLAND
- Language
- English
- ISSN
- 2043-9377
- Electronic ISSN
- 2043-9385
FAQ
Frequently asked questions about Grey Systems-Theory and Application
What CAS zone is Grey Systems-Theory and Application in?
In the 2025 upgraded edition of the CAS Journal Ranking, Grey Systems-Theory and Application is in Zone 3 of Engineering, and in Zone 3 of the minor category Mathematics, Interdisciplinary Applications. In the 2026 Xinrui edition it is in Zone 2 of Engineering. Zones from different editions, and from major and minor categories, are not interchangeable.
What is the impact factor of Grey Systems-Theory and Application?
The latest impact factor listed by LetPub is 4.57; CiteScore 6.3, h-index 39.
Which databases index Grey Systems-Theory and Application?
According to LetPub and DOAJ records, Grey Systems-Theory and Application is indexed in SCIE and Scopus.
Is Grey Systems-Theory and Application open access, and what is the APC?
Grey Systems-Theory and Application is a subscription journal. Fee information is not available yet; check the journal's website.
Sources and updates
The facts on this page come from LetPub, OpenAlex; every figure is tagged with its source and the date it was observed, and conflicting values are kept per source. LetPub source page: view ↗ (archived 2026-08-25). Last updated: .