Understanding Conflicts of Interest in Peer Review

Conflicts of interest (COI) in peer review occur when a reviewer’s objectivity is compromised by personal, financial, academic, or professional relationships with the authors, their institution, or the subject matter of the manuscript. In engineering research, where collaborative projects, industry funding, and interdisciplinary teams are common, the potential for COI is particularly high. A reviewer might have co-authored with the manuscript authors in the past, served as a thesis advisor, consulted for a company that stands to benefit from the findings, or hold a patent related to the work. Even perceived conflicts, where no actual bias exists, can erode trust in the review process if not properly managed.

The consequences of unmanaged COI can be severe: biased reviews may accept flawed research, reject valid work, or delay important findings. In engineering disciplines, such failures can have real-world impacts on public safety, infrastructure design, and technological innovation. Maintaining rigorous ethical standards is therefore not just a matter of academic integrity but also one of professional responsibility.

Types of Conflicts of Interest

Conflicts can be categorized into several types, each requiring specific management strategies:

  • Financial Conflicts: Reviewers who hold stock in a company that owns the technology described in the manuscript, receive consulting fees from the sponsoring organization, or stand to gain financially from publication or suppression of the results.
  • Personal Conflicts: Familial relationships, close friendships, or long-standing personal rivalries with the authors. Even former students or mentors can carry unconscious bias.
  • Professional Conflicts: Recent or ongoing collaborations, shared grants, serving on the same committees, competing for the same funding, or working at the same institution.
  • Ideological or Competitive Conflicts: Strongly held theoretical beliefs or competition for priority in a hot research area may lead a reviewer to favor or oppose a manuscript regardless of its merits.

Best Practices for Identifying and Disclosing COI

Effective management begins with clear identification and transparent disclosure. The following practices are recommended by leading engineering journals and professional societies.

Pre-Review Disclosure Requirements

Journals should mandate that reviewers disclose any potential COI before accepting a review invitation. This can be integrated into the reviewer portal through a simple checklist covering financial relationships, collaborations, and institutional affiliations. Reviewers must be instructed to err on the side of disclosure. Even minor connections should be mentioned so that editors can assess whether recusal is necessary.

Periodic Database Updates

Maintaining a database of reviewer disclosures—updated annually or upon significant changes—reduces administrative burden and ensures that conflicts are documented before a review is assigned. Some systems auto-flag potential conflicts by comparing reviewer profiles with author metadata, but human oversight remains essential because databases cannot capture all subtle relationships.

Author-Disclosed Conflicts

Authors should also be asked to suggest reviewers or list individuals they consider conflicted, though journals must verify these claims. This practice, common in many engineering fields, helps editors avoid inadvertent assignments. However, editors should balance author preferences with the need for impartial expertise.

Recusal and Alternative Assignments

When a conflict is identified, the reviewer must recuse themselves promptly. The editor should then assign an alternative reviewer with no competing interests. Recusal should be handled gracefully; reviewers should not feel penalized for honesty. Some journals allow a reviewer to assess only a portion of the manuscript if the conflict is limited, but this approach is risky unless handled with extreme care.

In cases where the COI is manageable—for example, a reviewer who has a distant collaboration that ended years ago—the editor may decide that the reviewer can proceed if the conflict is disclosed to the authors and they raise no objection. Such decisions must be made transparently and documented in the editorial system.

Editorial Oversight and Accountability

Editors serve as the first line of defense against COI. Their responsibilities include:

  • Scrutinizing all disclosures and making case-by-case determination of whether a disclosed relationship poses a significant risk to objectivity.
  • Assigning a second reviewer when a first reviewer’s conflict is borderline, ensuring that at least one unbiased opinion is secured.
  • Documenting decisions about permissible conflicts and the rationale behind accepting or recusing a reviewer.
  • Training editorial board members to recognize and handle less obvious conflicts, such as those arising from competition or intellectual property.

Some journals employ a conflict of interest committee to review contentious cases. In high-stakes engineering research (e.g., structural safety, energy systems), such committees can provide an additional layer of assurance.

Clear Policies and Communication

Journals must establish and communicate clear COI policies that outline definitions, disclosure procedures, consequences for noncompliance, and any exemptions (e.g., for opinion pieces or editorials). Policy documents should be easily accessible on the journal website and referenced in reviewer invitations. Sample policies can be adapted from organizations like the Committee on Publication Ethics (COPE) or the IEEE Conflict of Interest Policy.

Transparent Reporting to Authors

Authors should be informed when a reviewer has recused themselves due to a conflict, and they should be given the opportunity to object to a reviewer if they discover a previously undisclosed relationship. This fosters a culture of openness and accountability.

Training and Education for Reviewers

Many engineering researchers receive little formal training in ethical review practices. Journals can address this gap by providing:

  • Online modules covering COI types, case studies, and proper recusal procedures.
  • Annual workshops at major conferences (e.g., ASME, ASCE, IEEE) with role-playing scenarios.
  • Post-review feedback where editors can note whether a reviewer’s handling of a potential conflict was appropriate, reinforcing good behavior.

Training should also address cognitive biases—such as anchoring, confirmation bias, and the halo effect—that can distort reviews even in the absence of explicit COI. Recognizing these biases helps reviewers maintain objectivity.

Consequences for Noncompliance

When reviewers fail to disclose conflicts or submit biased reviews, journals must act decisively to preserve trust. Consequences range from:

  • Letter of reprimand for minor, unintentional omissions.
  • Temporary suspension from reviewing for the journal for repeated violations.
  • Permanent ban for egregious, deliberate concealment.
  • Notification of the reviewer’s institution if the violation suggests a pattern of ethical failure.

Journals should apply these consequences consistently, regardless of the reviewer’s seniority or reputation. A public transparency statement in the journal can demonstrate the seriousness of the policy.

Technological Solutions for COI Management

Modern peer review platforms offer tools to streamline COI detection and management. For example:

  • Automated conflict-checking using databases of co-author networks, institution affiliations, and funding sources. Systems like ScholarOne and Editorial Manager allow editors to see a “conflict score” for each prospective reviewer.
  • ORCID integration enables reviewers to link their professional records, making it easier to spot overlapping collaborations.
  • Confidentiality agreements built into the reviewer invitation remind reviewers of their obligations and ask them to confirm they have no conflicts before proceeding.

Technology cannot replace human judgment, but it can flag potential issues that might otherwise slip through. Editors should use these tools as screening aids, not as final arbiters.

Case Studies in Engineering Peer Review

Real-world examples illustrate the importance of robust COI management:

Case 1: A reviewer for a structural engineering journal was assigned a manuscript on a new steel alloy. The reviewer failed to disclose that they had recently submitted a competing patent covering similar alloy compositions. The review was harshly critical, and the manuscript was rejected. Later, the reviewing editor discovered the undisclosed patent application and the resulting conflict. The manuscript was re-reviewed by an unbiased expert and eventually accepted. The journal issued a public apology and suspended the original reviewer for two years.

Case 2: An engineering professor was asked to review a paper by a former postdoc who had left the lab one year prior. The reviewer disclosed the relationship, and the editor decided that since the collaboration had ended and the reviewer had not supervised the manuscript work, the review could proceed. The review was fair and constructive, demonstrating that not all former relationships necessitate recusal—but transparency was key.

International Perspectives and Cultural Variations

COI norms vary across countries and cultures. In some engineering communities, it is common for reviewers to have close ties with authors from the same small research field. Editors must be sensitive to these dynamics while upholding universal ethical standards. Clear definitions of “relationship” and “conflict” should be provided, and journals should offer guidance in multiple languages if they serve a global audience. The World Association of Medical Editors has guidelines that, although medical-focused, offer transferable principles for engineering editors.

Future Directions: Open Peer Review and COI

The growing adoption of open peer review—where reviewer identities are revealed and review reports are published alongside articles—may reduce COI because reviewers know their potential bias will be visible to readers. However, open review also introduces new complexities: reviewers may fear retribution from powerful authors, or they may be reluctant to criticize friends publicly. Journals experimenting with open review must pair it with robust COI policies and a commitment to constructive, professional feedback.

Another emerging trend is the use of artificial intelligence to analyze reviewer-author networks and predict undisclosed conflicts. While promising, AI tools must be developed in consultation with ethics committees to avoid false positives and privacy violations.

Conclusion

Managing conflicts of interest in peer review is a continuous ethical endeavor that requires commitment from reviewers, editors, institutions, and publishers. By implementing clear disclosure processes, enforcing recusal rules, training the reviewer community, and leveraging technology appropriately, engineering journals can safeguard the objectivity and reliability of their scholarly output. As engineering research becomes more collaborative and industry-connected, these best practices will only grow in importance. Upholding the integrity of peer review is not merely a procedural formality—it is the foundation upon which trust in engineering science is built.