Journal of the ACM: Metrics and Scope

Journal of the ACM

Journal of the ACM (JACM) is the flagship archival journal published by the Association for Computing Machinery (ACM), indexed in Clarivate's Science Citation Index Expanded (SCIE) across multiple computing disciplines including Computer Science, Theory and Methods. Its Journal Impact Factor (JIF) measures the average citation rate in a Journal Citation Reports (JCR) year for citable items published during the preceding two years. In accordance with DORA and CoARA principles, its journal-level metrics must not be used as evaluative proxies for individual paper quality or researcher excellence.

ByCASRAI Editorial Board

· Last updated 7 Nov 2026

What the Metric Measures

The Journal Impact Factor (JIF) assigned to the Journal of the ACM represents the annual citation ratio calculated by Clarivate Analytics in the Journal Citation Reports. Specifically, the metric measures how frequently citable items—defined by Clarivate as research articles and reviews—published in JACM during the two preceding calendar years were cited by indexed publications during the evaluation year.

In addition to the standard two-year metric, Clarivate reports a five-year Journal Impact Factor, which provides a broader citation window that better captures the extended citation half-life characteristic of foundational theoretical computing manuscripts.

Calculation Methodology

The annual Journal Impact Factor for JACM is determined strictly according to Clarivate’s mathematical formula:

JIF = (Citations in Year t to items published in Years t-1 and t-2) / (Total citable items published in Years t-1 and t-2)

For example, to evaluate the metric for data year 2024, Clarivate tallies all citations recorded across the Web of Science Core Collection in 2024 pointing to JACM articles published in 2022 and 2023, dividing that sum by the number of substantive papers published by JACM across those two years. As with other major titles tracked on our platform, such as Scientific Reports, editorials, correction notices, and front matter are excluded from the denominator.

Disciplinary Context: Conferences versus Archival Journals

Interpreting journal-level metrics in computer science requires understanding the discipline’s unique publishing structure. As analyzed in CASRAI’s comparative study on CS conference vs journal authorship credit, researchers in theoretical computer science, algorithms, and systems prioritize peer-reviewed conferences (such as STOC, FOCS, and POPL) for primary dissemination of breakthroughs.

Consequently, JACM functions primarily as a selective archival venue where authors publish comprehensive, fully elaborated versions of earlier conference papers with complete proofs and expanded experimental validations. Each published volume is assigned a permanent Crossref DOI to ensure persistent resolution across scholarly systems.

Indexing and Category Quartiles

According to the Clarivate Web of Science Master Journal List (ISSN: 0004-5411; eISSN: 1557-735X), the Journal of the ACM is indexed in the Science Citation Index Expanded (SCIE) across four core subject categories:

Computer Science, Theory and Methods
Computer Science, Hardware and Architecture
Computer Science, Information Systems
Computer Science, Software Engineering

Within these categories, JACM consistently ranks in top quartiles, reflecting its selective acceptance rate and high scholarly prestige among theoretical researchers.

Responsible Use in Research Assessment

Major international assessment frameworks, including the San Francisco Declaration on Research Assessment (DORA) and the Coalition for Advancing Research Assessment (CoARA), strongly advise against using journal-level metrics to evaluate individual papers or researchers.

Because citation distributions across published articles are highly skewed, a journal’s aggregate citation score cannot predict the scientific quality, reproducibility, or long-term significance of any specific paper published in JACM. Hiring committees, tenure review panels, and grant agencies should assess the direct scholarly content and scientific rigor of contributions rather than relying on journal impact indicators as surrogates for merit.

Sources

Clarivate. Web of Science Master Journal List: Journal of the ACM (ISSN 0004-5411). Accessed 2026-11-07. URL: https://mjl.clarivate.com
San Francisco Declaration on Research Assessment (DORA). DORA Principles and Recommendations. Accessed 2026-11-07. URL: https://sfdora.org/read/
Association for Computing Machinery. ACM Publications Policies and Archival Standards. Accessed 2026-11-07. URL: https://www.acm.org/publications/policies

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