This book puts forward interlegal reasoning as a means of coping with normative legal pluralism, that is, with conflicts between competing legal systems, such as national law, European law, international law, and indigenous law. It introduces interlegal reasoning as a distinct conceptual category, bringing together interlegality and legal argumentation theory to address transnational challenges and conflicts of norms sourced in more than one legal system. In this regard, it builds upon recent literature on interlegality and legal entanglements.
The book explicitly focuses upon legal reasoning and methodologies, especially concerning balancing. In addition to interlegality, the content is positioned in what may be described as a turn to interfaces, denoting interactive, multi-perspectival, and variable connections whose origination depends on the legalities involved, or more specifically on the legal reasoning employed by their participants concerning the facts at issue. Further, the respective contributions, in addition to focusing on legal reasoning and balancing as a method of rational justification, consider a broader scope concerning interlegal conflicts of all kinds, not merely national and international legalities. Accordingly, the book offers a valuable resource for researchers, but also practitioners, dealing with problems of intersecting and conflicting legalities.

Offers a novel and integrative approach to interlegality and legal reasoning Provides cutting-edge research on normative legal pluralism Presents groundbreaking contributions on the legitimate scope of adjudication under interlegality

Autorentext

Dr. Gabriel Alejandro Encinas Duarte, PhD, Professor at Universidad Autónoma de Baja California (Ensenada, Mexico). Alexander von Humboldt Research Fellow at the University of Erlangen-Nürnberg 2023-25. PhD in Human Rights and Global Politics, Sant Anna School of Advanced Studies, Pisa, Italy (2017-2021). LLM in Legal Theory, Goethe University Frankfurt am Main and European Academy of Legal Theory (2017). Author of Foxes and Hedgehogs on Institutional Justification through Law: A Dialogue, UABC, 2025, coeditor of Ordenamiento Jurídico: Fundamentos y Apertura, Derecho Global Editores, 2021, and diverse articles and chapters, including Interlegal Argumentation in the UK Drill Music decision of Meta s Oversight Board (Journal of Argumentation in Context), The Idea of Interlegal Balancing in Multilevel Settings in the collective volume Accommodating Diversity in Multilevel Legal Orders (Routledge, 2023), and Interlegal Balancing: A Concept, Two Contexts, Some Circumstances (Rivista di filosofia del diritto). Main fields of research: legal theory, legal pluralism, legal argumentation theory.

Prof. Dr. jur. Jan-Reinard Sieckmann, Professor of Legal Theory and Philosophy of Law at the University of Erlangen-Nürnberg, studied Law and Philosophy at the University of Göttingen, First and Second Law Exam (1983, 1990), Doctorate at the University Göttingen 1988, Habilitation at the University of Kiel 1997, Professor of Public Law at the University of Bamberg 1998-2008, since 2009 at the University of Erlangen-Nürnberg, since 2016 Professor of Legal Theory and Philosophy of Law; DAAD-Professor at the University of Buenos Aires 2007-2012. Main fields of research: legal philosophy, argumentation theory, human and constitutional rights.

Inhalt

Introduction: Advancing Interlegal Reasoning.- Part I: Conceptual Foundations of Interlegal Reasoning.- An Outline of Interlegal Balancing.- Interlegal Reasoning through Interface Doctrines: The Example of the Fourth Instance Formula.- Inter-Legality and Legitimacy of International Courts.- Part II: Methodological Approaches.- Balancing within or without the Hierarchy: Intra- and Inter-Legal Reasoning from a Participant's Perspective.- Interlegal Reasoning and Judicial Minimalism.- Legal Transnationality and Access to Justice.- Bridging Legalities: Transconstitutionalism and Inter-legal Reasoning.- Part III: Interlegal Reasoning in Human Rights, Regional, and International Law.- Interlegal Imbalancing: Conditional Recognition and the Bosphorus Presumption.- Reassessing the Margin of Appreciation in ECtHR jurisprudence: Inter-Legal Reasoning, Proportionality, and the Rights of Sexual Minorities.- Interlegality and Human Rights: Implementing the Decisions of the Inter-American Human Rights System at the National Level. The Alex Lemún Case.- UNCLOS, Paris Agreement and the 'External' Sources: Promising Inter-Legal Reasoning in Climate Litigation.- Part IV: Interlegal Reasoning, Interculturality, and Asymmetry.- Incommensurability and Interlegality: Communicative Foundations of Universal Human Rights.- Possible Worlds: The Intercultural Way and A Constitutional Court that Heeds It.- Navigating Legal Pluralism: NGOs as Jurisgenerative Actors.