A conflict of interest arises when financial, professional, personal, or other circumstances may influence — or may be perceived to influence — the objectivity of preparing, reviewing, or publishing scholarly work. Transparent disclosure of such circumstances is a mandatory condition of cooperation with the European Journal of Interdisciplinary Issues and is consistent with the recommendations of COPE and the ICMJE.

Authors are required to disclose all potential conflicts of interest — both financial (grants, scholarships, fees, patents, consulting agreements, equity holdings, payment for preparing the material) and non-financial (personal, academic, or political affiliations, organisational memberships, competing scholarly positions). Each article must state the sources of research funding and the role of the sponsors. Where no conflict of interest exists, authors include the statement: "The authors declare no conflict of interest."

Reviewers must decline to review a manuscript if they have a conflict of interest regarding its authors, content, or sources of funding, or if they cannot ensure an impartial assessment. Information obtained during review may not be used for personal advantage.

Editors and members of the Editorial Board do not participate in decisions on manuscripts with which they have a conflict of interest (including their own work or that of close colleagues and co-authors); in such cases the manuscript is handled by another editor. Publication decisions are based solely on scholarly quality, originality, and relevance to the journal's scope, and never on commercial or personal interests.

An undisclosed conflict of interest discovered after publication is treated as a breach of publication ethics and may result in a clarification or the retraction of the article.