https://copilot.microsoft.com/chats/imyQrvjiVgJyhU6o2FGTv
Prof. Dr. Carmelo Borrego
Nothing is without a reason." (Nihil est sine ratione.) (Leibniz)
Abstract
The final judgment of the International Court of Justice (ICJ) is not merely the formal end of contentious proceedings. It is an institutional act that converts jurisdictional authority and procedural rules into a legally authoritative decision with inter-partes effects. This paper examines the judgment’s ontology—its status as a juridical act—through three connected dimensions: the institutional basis of its validity, including jurisdiction and procedural prerequisites; the normative and argumentative structure that links facts to law through reasoning, interpretation, and the dispositive clause; and the stabilizing role of res judicata as normative closure for matters decided. The analysis relates the judgment’s justificatory legitimacy to the structure of claims (petitum) and the limits imposed by ne ultra petita, while also considering the role of iura novit curia within the permissible decision perimeter. It concludes by proposing a functional taxonomy of ICJ pronouncements—orders, motivated incidental decisions, judgments, and advisory opinions—to show how their distinct effects shape the judgment’s doctrinal role as the principal carrier of cosa juzgada in contentious cases.
Keywords
International Court of Justice; ICJ judgments; res judicata; ne ultra petita; iura novit curia; jurisdiction; admissibility; judicial reasoning; legal ontology; taxonomy of ICJ decisions.
1. Introduction: Why the “Final Judgment” Deserves Ontological Attention
Contested disputes before the ICJ culminate in a “final judgment” that resolves the parties’ claims and produces legal effects. Yet the judgment’s institutional significance is not exhausted by its chronological position in the procedure. It acts as a bridge between (a) jurisdictional competence and procedural constraints, (b) evidentiary and argumentative processing, and (c) the stabilization of legal consequences. The question is therefore not merely what the judgment *does*, but how it is constituted as the kind of act that can do it—how it exists as a juridical entity and how its structure authorizes its effects.
An ontological approach asks: what kind of act is a final judgment, and what are its constitutive features? In international adjudication, that question is inseparable from the judgment’s legal authority and from the procedural architecture that confers normative power on the Court’s pronouncements. If validity and effects are grounded in legal rules, then the judgment’s “being” depends on those rules and on the disciplined path by which the Court moves from submissions to decision.
The ontological lens also clarifies why decision-form matters. ICJ pronouncements vary in their function: some maintain procedural order, others decide incidental matters, others resolve the merits, and advisory opinions provide authoritative legal guidance without the inter-partes logic of contentious litigation. Without a taxonomy of pronouncement types and their effects, it becomes easy to conflate the judgment with other decision forms that do not carry the same stabilizing force.
This paper therefore pursues three aims. First, it characterizes the judgment as an institutional act whose validity is linked to jurisdiction and procedure. Second, it explains the judgment’s internal structure as the mechanism by which facts are converted into legally assignable consequences through interpretation and reasoning. Third, it situates the judgment within the ICJ decision ecosystem by distinguishing orders, motivated incidental decisions, judgments, and advisory opinions according to their function and legal effect.
2. The ICJ Final Judgment as an Institutional Act
A final judgment is produced by an organ that is empowered to decide disputes between States. The Court’s empowerment is not a sociological fact but a legal arrangement: the UN Charter and the Court’s Statute and Rules establish the conditions under which the Court may pronounce with binding authority. Consequently, the judgment’s being as a juridical act depends on competence and procedural regularity rather than on the mere existence of a declaratory text.
2.1 Validity: Jurisdiction and Procedural Prerequisites
The judgment’s validity rests on the Court’s jurisdiction and on the proper management of procedural conditions that frame the case. In practice, that includes admissibility and other procedural requirements that delimit the Court’s capacity to entertain the merits. Without those conditions, a pronouncement cannot legitimately claim the authority that attaches to a merits decision.
This point can be stated as a conceptual relationship: jurisdiction and admissibility determine whether the Court may validly convert the dispute into a decision with authoritative consequences. The “final judgment” does not simply express opinions about law; it generates a legal outcome because the Court is acting within the legally constituted conditions that make such an outcome permissible.
2.2 The Judgment as Closure of the Contentious Instance
Beyond validity, the judgment has a distinct role in bringing the contentious proceeding to an end. The final judgment completes the procedural cycle by resolving the dispute in the terms that define the *théma decidendum*. It is the moment when the Court’s adjudicatory activity is translated into a stable outcome for the parties.
The conceptual implication is straightforward: the judgment is the point where procedural work is condensed into a legally operative decision. The Court does not stop reasoning after reaching a conclusion; instead, it performs the decision act whose form gives it institutional force. That is why the judgment should be understood not only as a communication, but as a decision with a validity structure governed by the rules of the legal order.
3. From Submissions to Decision: How the Judgment Links Facts to Legal Consequences
A final judgment is not a mechanical transcription of claims. It depends on an argumentative transformation in which the Court relates proven facts (as established in the case) to applicable norms. This transformation is central to the judgment’s ontology: it is the mechanism that gives the decision its claim to correctness.
3.1 The Argumentative Structure: Jurisdiction, Reasoning, and the Dispositive Clause
An ICJ judgment typically contains: procedural history; jurisdiction and admissibility determinations (where relevant); presentation of the parties’ submissions; the reasoning that sets out the Court’s legal analysis; and the operative part (dispositive clause) that states the decision and records voting. The reasoning section is the argumentative engine: it provides the rational link that makes the outcome intelligible as more than a conclusion.
The dispositive clause is equally important. It materializes the legal consequences in the Court’s authoritative form, delimiting what the parties must accept as determined. In contentious proceedings, this is precisely where res judicata effects attach—subject to the boundaries of the decision perimeter.
3.2 The Role of Evidence and Interpretation
The Court’s conversion of facts into legally relevant findings is not purely descriptive. It involves interpretation of what the evidence proves and how facts relate to the elements of legal norms. This is where legal reasoning becomes decisive. The judgment must show, in a manner that can be criticized and assessed, why certain facts are legally decisive and why particular legal consequences follow.
Interpretation is therefore not an optional step but part of the Court’s adjudicatory nature. If legal norms do not apply automatically to raw facts, then the judgment’s reasoning is the structured process by which norms are made operative in a particular factual setting.
3.3 Justificatory Legitimacy: Rational Quality and Coherence
Justificatory legitimacy depends on more than outcomes; it depends on the rational quality of the reasoning. The Court’s responsibility includes coherence: the judgment should consistently connect (i) what it takes to be proven, (ii) what legal rules it treats as applicable, and (iii) what conclusions it derives.
In this sense, the judgment can be criticized on internal grounds: contradiction within reasoning, arbitrariness in evidentiary selection, or failure to articulate the connection between facts and legal norms. When such defects exist, the judgment may remain a legally valid act within institutional constraints, but it becomes defective in relation to the claim to correctness required of adjudication.
4. Ne ultra petita and Iura novit curia: The Decision Perimeter
Two doctrinal constraints explain why judgments are simultaneously powerful and disciplined. Ne ultra petita prevents the Court from deciding beyond what the parties have requested. Iura novit curia recognizes the Court’s authority to determine the legal character or applicable legal rules, even if parties emphasize different legal bases.
4.1 Ne ultra petita as a Boundary of Authority
In contentious proceedings, the parties’ final submissions define the théma decidendum. That delimitation is not only procedural; it governs the legal perimeter of the judgment. The Court cannot grant more than requested or decide matters that fall outside the scope of the submissions.
This principle supports legal certainty and party autonomy within adjudication. The parties select what they ask the Court to resolve; the Court’s authority is exercised within that selection. The boundary operates both in scope and in form: the judgment’s operative clause is constrained by the shape of what was asked.
4.2 Iura novit curia as Legal Freedom within the Perimeter
At the same time, the Court is not limited to the parties’ legal labels. Under iura novit curia, the Court determines the relevant law and its proper interpretation. Yet this legal freedom remains bounded: the Court’s legal reasoning must remain within the factual and substantive perimeter established by the submissions.
The interaction between the two principles can be conceptualized as follows: parties define the “what” of the dispute to be resolved, while the Court determines the “law” relevant to resolving that “what,” within the established perimeter. This structure preserves both adjudicatory authority and procedural fairness.
5. The Effect of the Judgment: Res judicata and Normative Stabilization
The defining legal consequence of an ICJ final judgment in contentious proceedings is its binding force and its res judicata effect between the parties. This effect is not just a procedural closure; it creates a stabilization of legal determinations that prevents the relitigation of what has been decided, within the limits of the judgment’s scope.
5.1 The Judgment as a Source of Inter-Partes Stability
Res judicata transforms contested uncertainty into a determinate legal position for the parties. After the judgment, the parties must treat the decided matters as settled. This stabilization protects the rational economy of adjudication: it ensures that legal disputes do not become endless cycles of re-argument over the same resolved claims.
5.2 Validity vs. Efficacy
While the judgment’s binding nature and res judicata effects reflect legal validity, efficacy—actual implementation in practice—may depend on political and institutional circumstances. International adjudication lacks an always-present, centralized enforcement apparatus analogous to domestic executive enforcement. Consequently, the judgment’s stabilizing effects are first and foremost legal: compliance may require further institutional processes.
This distinction clarifies why the ontological and normative analysis remains essential. The judgment’s being as a legal act generates binding consequences, even if real-world outcomes require additional channels to secure compliance.
6. Taxonomy of ICJ Pronouncements: Why Decision Types Cannot Be Conflated
To understand the final judgment’s ontology, it is crucial to distinguish it from other ICJ pronouncements. The Court issues various decision forms during the proceeding. Each has a different function and different legal effects.
6.1 Orders and Interim Measures
Orders manage procedural life. They maintain the continuity and effectiveness of the proceedings and may address urgent procedural needs. When the Court orders interim measures, it does so to preserve rights pending final decision, without resolving the merits.
The key feature: orders are oriented toward procedural effectiveness rather than merits resolution. Their legal effects are therefore limited to what is necessary for the procedural context.
6.2 Motivated Incidental Decisions
Motivated incidental decisions address specific procedural or incidental questions that arise during the case. They clarify issues that shape how the case will proceed. These decisions bind in relation to what they decide, but they do not substitute for the final merits adjudication.
6.3 The Merits Judgment
The merits judgment resolves the dispute on the théma decidendum. It is the decision type that produces res judicata between the parties regarding matters determined in the judgment’s operative part and within its scope.
This is why the final judgment occupies a central place in the Court’s decision ecology: it is the institutionally authorized vehicle for judicial closure of the contentious merits.
6.4 Advisory Opinions
Advisory opinions respond to legal questions posed by authorized UN organs and agencies. They do not arise from contentious inter-partes litigation and do not produce res judicata between the parties in the same way a merits judgment does. Their legal force lies elsewhere: in their interpretive and argumentative authority as an institutional statement of legal understanding.
Thus, advisory opinions are not “judgments” in the contentious sense. Their function belongs to a different legal mode: guidance rather than dispute settlement between parties with binding closure.
7. Doctrinal Perspectives: Reading the ICJ Judgment through Jurisprudential Lenses
The judgment’s ontology can be illuminated by multiple jurisprudential frameworks. Each emphasizes a different aspect of the act: its normative content, its interpretive character, or its justificatory structure.
7.1 Positivist and Rule-Based Readings: Adjudication as Application within a System
From a positivist standpoint, the judgment is an act of applying law through institutional competence and procedural validation. The Court’s authority derives from a legal system that recognizes it as empowered to produce individual legal determinations. The judgment’s validity corresponds to compliance with the system’s criteria for judicial acts.
7.2 Interpretivist Readings: The Judgment as Best Justified Legal Construction
An interpretivist approach views the judgment as an outcome of legal interpretation that aims to provide the best overall justification within the legal practice. The judgment is not a brute act; it is a structured legal construction that contributes to the development of international law while resolving the specific dispute.
7.3 Argumentation-Based Readings: Discourse, Coherence, and the Structure of Justification
Argumentation approaches highlight the judgment as a discursive act. The Court processes parties’ arguments, evaluates evidence, and constructs a justificatory path that links premises (facts as found, legal rules as interpreted) to a conclusion (the operative result). When principles conflict, reasoning includes balancing or structured preference rather than pure deduction.
These lenses converge on the same institutional insight: the judgment’s authority is not merely asserted; it is produced through reasoning that can be checked for coherence and rational linkage.
8. The Relationship between the Final Submissions and the Final Judgment
The final submissions of the parties delimit the dispute. They determine the material scope of what the Court may decide under ne ultra petita. Therefore, the connection between oral proceedings and written final submissions is not merely chronological; it is structural.
8.1 Oral Pleadings as Argumentative Orientation
Oral pleadings serve to reinforce and clarify what the parties have already set out in their final written submissions. They are part of the argumentative process that informs the Court’s understanding of the dispute. Yet when discrepancies exist, the final submissions define the decisive perimeter.
8.2 Coherence Requirements for Procedural Clarity
The Court must identify what the parties coherently request. If a party presents incompatible requests, the Court’s task is to determine which request is procedurally and substantively coherent for a judicial response. Parties can mitigate strategic tensions by structuring principal and subsidiary claims, enabling the Court to address alternatives without losing internal coherence.
9. Conclusion
The final judgment of the International Court of Justice is more than the procedural endpoint of contentious proceedings. It is a juridical act whose authority derives from the conjunction of institutional competence, procedural regularity, and reasoned legal justification. Its legal significance lies not merely in announcing a result, but in transforming a contested dispute into a binding legal determination through an authorized process of adjudication.
Viewed from an ontological perspective, the judgment exists as a legally constituted act whose validity depends upon jurisdiction and compliance with the procedural framework established by the Court's Statute and Rules. Its normative force is generated through a structured operation that links established facts, interpreted legal norms, and judicial reasoning to an operative determination capable of producing legal consequences. The judgment's dispositive clause is therefore not an isolated declaration, but the culmination of an argumentative process that seeks to justify the transition from dispute to decision.
The analysis has also shown that judicial authority is simultaneously empowered and constrained. The principle of ne ultra petita confines adjudication to the dispute as defined by the parties, while iura novit curia preserves the Court's authority to identify, characterize, and interpret the applicable law within that framework. Together, these principles establish the decision perimeter within which judicial reasoning may legitimately operate.
The distinctive role of the final judgment becomes most apparent in its stabilizing effect. Through its binding force and res judicataconsequences, the judgment converts legal uncertainty into authoritative determination and provides normative closure for matters decided between the parties. This stabilizing function is fundamental to the rationality and legitimacy of international adjudication, ensuring that the judicial settlement of disputes serves not merely to resolve disagreements but also to secure legal certainty within the international legal order.
Finally, distinguishing merits judgments from orders, reasoned incidental decisions, and advisory opinions clarifies the unique place of the final judgment within the Court's institutional practice. Among the various forms of ICJ pronouncements, the merits judgment remains the principal vehicle through which international law achieves authoritative dispute settlement and inter-partes legal stabilization. Its ontology is therefore inseparable from its function: it is the legal form through which adjudicatory authority becomes binding determination, and through which the exercise of judicial reason attains enduring legal significance.
