Tribunal Deliberation Confidentiality in Arbitration

1. Introduction

Tribunal deliberation confidentiality is the principle that discussions, communications, opinions, voting positions, draft decisions, and reasoning exchanged among members of an arbitral tribunal during the decision-making process should remain confidential and generally should not be disclosed to the parties, third parties, or reviewing courts.

It is distinct from the broader confidentiality of the arbitration itself. Confidentiality of the proceedings concerns pleadings, evidence, hearings and awards; deliberative secrecy focuses specifically on the tribunal's internal decision-making process.

The modern approach is that deliberations enjoy very strong protection, because arbitrators must be able to:

express provisional views freely;

disagree with one another;

change their minds;

compromise on wording or reasoning;

discuss weaknesses in each other's positions;

deliberate without fear that every statement will later be scrutinised by the parties; and

reach a decision independently of external pressure.

The Singapore International Commercial Court described the default position as confidentiality of arbitrators' deliberations and emphasised that the rule protects freedom from outside scrutiny and influence. (eLitigation)

The principle, however, is not absolutely unlimited. Exceptionally serious allegations concerning the integrity or functioning of the tribunal can justify judicial scrutiny, particularly where the evidence sought concerns an objective procedural fact, rather than the arbitrators' mental processes.

2. Meaning of Tribunal Deliberations

"Deliberations" encompass considerably more than a formal meeting in which arbitrators sit together.

They may include:

oral discussions between arbitrators;

emails exchanged among tribunal members;

memoranda circulated between arbitrators;

comments on draft awards;

preliminary voting positions;

discussions concerning factual and legal findings;

draft procedural orders;

internal notes;

exchanges concerning the tribunal's reasoning;

communications concerning whether and how a dissenting opinion should be formulated; and

other communications forming part of the tribunal's internal decision-making process.

The confidentiality principle is therefore functional rather than merely physical. It does not depend on the arbitrators literally sitting together in a "deliberation room."

This is particularly important in modern international arbitration, where deliberations frequently occur through email, videoconference and collaborative electronic documents.

3. Why Is Deliberation Confidential?

There are several interconnected policy justifications.

A. Freedom of judicial/arbitral decision-making

An arbitrator should be able to say:

"I initially disagree, but I am persuaded by your argument."

without worrying that this statement will later be used to attack the award.

If every provisional opinion could be disclosed, arbitrators might become excessively cautious.

B. Protection against external influence

Confidentiality protects arbitrators from pressure by:

parties;

party-appointed arbitrators;

counsel;

institutions;

governments;

media; and

commercial interests.

C. Protection of collegiality

A three-member tribunal requires disagreement and compromise.

A tribunal cannot function effectively if every disagreement automatically becomes potential evidence in a set-aside application.

D. Protection of finality

If parties could routinely cross-examine arbitrators about how they reached their conclusions, arbitral proceedings could effectively continue indefinitely.

This concern was strongly reflected in Noble China Inc. v Lei, where the Ontario court emphasised the dangers of converting review of an award into a review of the arbitrators themselves through cross-examination. (vLex)

E. Protection of arbitral independence

Confidential deliberations are especially important in tribunals containing a party-appointed arbitrator.

An arbitrator must ultimately decide the dispute independently rather than acting as an advocate for the party that appointed him or her.

4. Deliberation Confidentiality Is Different From General Arbitration Confidentiality

This distinction is crucial.

Thus, a party may be entitled to receive the final award, but that does not ordinarily entitle it to obtain the arbitrators' emails explaining why they reached each conclusion.

5. Institutional Rules

Many arbitration rules expressly protect tribunal deliberations.

For example, the SIAC Rules expressly treat tribunal discussions and deliberations as confidential. The rules also contemplate limited exceptions for court proceedings, legal obligations and other specified circumstances. (LexMea)

Similarly, the ICSID Arbitration Rules expressly require tribunal members to maintain confidentiality regarding information obtained through the proceedings, including the tribunal's deliberations. (ICSID)

This is significant because deliberative confidentiality therefore operates on several possible legal foundations:

arbitration legislation;

institutional rules;

arbitration agreement;

procedural orders;

implied obligations of the arbitral process; and

common-law or general principles concerning adjudicative independence.

6. The Leading Case: CZT v CZU

CZT v CZU [2023] SGHC(I) 11

This is one of the most important modern decisions on tribunal deliberation confidentiality.

The arbitration involved a majority award and a dissenting arbitrator. The dissenting arbitrator made serious allegations concerning the conduct of the majority, including allegations concerning the way the majority had dealt with the record and the tribunal's reasoning.

The unsuccessful party sought disclosure of the tribunal's deliberations to support its challenge to the award.

The Singapore International Commercial Court held that:

the default position is that tribunal deliberations are confidential;

deliberative records are ordinarily protected against production;

arbitrators may sometimes be questioned concerning objective procedural events;

confidentiality does not necessarily prevent investigation of whether an arbitrator was excluded from the deliberative process;

the court should not ordinarily investigate the arbitrators' mental processes or reasoning; and

disclosure can occur only in exceptional circumstances.

The court emphasised the reasons for confidentiality: arbitrators need freedom to reflect upon evidence, change their views and debate issues without fear of later disclosure. (eLitigation)

Importance

CZT v CZU establishes a highly useful distinction:

Protected

"Why did you reach this conclusion?"

Potentially investigable

"Was Arbitrator X actually excluded from the deliberations?"

The first concerns the arbitrator's thought process.

The second concerns an objectively ascertainable procedural fact.

That distinction is central to modern deliberation-confidentiality jurisprudence.

7. CZT v CZU — Court of Appeal

CZT v CZU [2024] SGCA(I) 6

The Singapore Court of Appeal subsequently considered the issue.

The basic protection of deliberations was maintained, while recognising that confidentiality does not create an absolute shield against investigation of serious procedural misconduct.

The crucial principle is that the court must distinguish between:

the substance of deliberations, which is strongly protected; and

the integrity of the deliberative process, which can in an exceptional case require judicial examination.

This means that an arbitrator cannot simply invoke "confidentiality" to conceal allegations that the tribunal never properly deliberated, that one arbitrator was excluded, or that the tribunal's decision-making process was fundamentally compromised.

8. P v Q and Others

P v Q and Others [2017] EWHC 148 (Comm)

This English High Court decision is a leading authority demonstrating that deliberation confidentiality is powerful but not absolute.

The court considered whether documents generated during arbitral deliberations could be disclosed.

The court recognised a general principle of confidentiality surrounding tribunal deliberations but accepted that there could be exceptional circumstances in which disclosure might be ordered.

The case is particularly important because it opened the possibility of disclosure where the interests of justice require it, while stressing that such cases would be extremely unusual. The English position has subsequently been influential in international arbitration. (Courts and Tribunals Judiciary)

Principle

The case should not be read as creating a general discovery right into tribunal deliberations.

Rather:

confidentiality remains the rule; disclosure is the exceptional remedy.

9. Duke of Buccleuch v Metropolitan Board of Works

Duke of Buccleuch v Metropolitan Board of Works (1872) LR 5 HL 418

Although an old English authority, Duke of Buccleuch remains foundational.

The House of Lords distinguished between:

asking an adjudicator what occurred before him, and

asking the adjudicator how he reached his decision.

The latter was protected.

This distinction has been expressly relied upon by the Singapore courts in the modern arbitration context. (eLitigation)

Principle

An arbitrator may potentially be questioned about:

whether something was submitted;

what happened procedurally;

whether a particular event occurred.

But the arbitrator ordinarily cannot be compelled to explain:

why he voted a particular way;

how he weighed competing evidence;

why he preferred one legal argument;

what another arbitrator said during confidential deliberations.

This remains one of the most important conceptual foundations of deliberative secrecy.

10. Noble China Inc. v Lei

Noble China Inc. v Lei (1998), 81 O.T.C. 1 (Ont. Gen. Div.)

This Canadian case is particularly valuable because it dealt directly with arbitral deliberations.

A dissenting arbitrator attempted to provide evidence concerning the tribunal's internal deliberative process.

The Ontario court treated deliberative secrecy as a fundamental protection of the adjudicative process and ultimately rejected evidence that improperly invaded the tribunal's confidential deliberations.

The court was concerned that allowing arbitrators to become witnesses concerning their own decision-making would undermine:

finality;

independence;

collegial decision-making;

confidentiality; and

the integrity of arbitration. (vLex)

Significance

The case is especially important concerning dissenting arbitrators.

A dissent does not ordinarily give the dissenting arbitrator a licence to disclose confidential exchanges with the majority.

A dissenting opinion can explain the dissenting arbitrator's own reasons, but ordinarily should not expose confidential communications between the tribunal members.

11. Nathan v MJK Constructions

Nathan v MJK Constructions [1986] VR 75

The Supreme Court of Victoria drew a similar distinction between:

evidence concerning events occurring before the arbitrator; and

evidence concerning the arbitrator's reasons for reaching the decision.

The court accepted that an arbitrator could potentially give evidence about what occurred during the proceedings, while protecting the reasoning underlying the decision.

This distinction was expressly recognised in CZT v CZU. (eLitigation)

Practical significance

Suppose a party alleges:

"The tribunal refused to hear my expert."

That may raise a procedural question capable of investigation.

But:

"The arbitrator's email shows that he thought my expert was unconvincing."

is much more likely to fall within protected deliberative reasoning.

12. Dobish v Zollinger

Dobish v Zollinger, United States District Court for Nebraska

The US case is useful because it illustrates an important exception.

The applicant sought records of deliberations to establish an objective fact, namely that a party had waived a particular defence.

The court ordered production, subject to safeguards including in-camera judicial review.

The Singapore court regarded Dobish as consistent with the principle that arbitrators may sometimes be required to provide evidence concerning matters that occurred before them, while their actual reasoning remains protected. (eLitigation)

Key lesson

The question is not simply:

"Is this document part of the deliberations?"

The court should ask:

"What exactly is the party trying to prove with this document?"

If it seeks to discover the arbitrator's mental reasoning, confidentiality is very strong.

If it seeks to establish an objectively verifiable procedural fact, disclosure may be possible.

13. Yukos Proceedings and the Limits of Deliberation Secrecy

The Yukos arbitration litigation illustrates another dimension of the doctrine: the relationship between confidentiality and the non-delegable personal function of arbitrators.

Arguments were raised concerning the role of tribunal assistants and whether substantive functions had been delegated while being protected under the umbrella of deliberation confidentiality.

The controversy demonstrates that confidentiality cannot be used to transform every tribunal activity into an unreviewable matter.

The important principle is:

A tribunal cannot invoke deliberation secrecy to conceal a fundamental departure from the arbitrators' personal adjudicative mandate.

At the same time, courts must distinguish improper delegation from legitimate administrative assistance.

14. The Core Rule: Substance vs Process

The jurisprudence can be organised around a simple distinction.

Protected substantive deliberation

Examples:

"I think the claimant's evidence is unreliable."

"I disagree with Arbitrator 2's interpretation of Article 7."

"I think we should award EUR 4 million rather than EUR 6 million."

"The claimant's expert has not established causation."

"I initially favoured the respondent but changed my mind."

These are quintessentially confidential.

Potentially reviewable process

Examples:

Was an arbitrator excluded from deliberations?

Did the tribunal actually deliberate?

Was the award prepared by someone other than the arbitrators?

Did the tribunal refuse to consider a party's case altogether?

Was an arbitrator prevented from participating?

Was there corruption or improper external influence?

Did an unauthorised person effectively make the decision?

These may justify investigation in exceptional circumstances.

15. The "Very Rarest of Cases" Standard

The modern cases demonstrate an intentionally high threshold.

In CZT v CZU, the Singapore court indicated that an exception would arise only where:

the allegations are very serious;

there is a real prospect that they could succeed; and

the interests of justice in disclosure outweigh the policy reasons supporting confidentiality.

The court gave corruption or conduct attacking the integrity of arbitration as an example of the type of allegation capable of crossing the threshold. (Mondaq)

This prevents parties from using allegations of "bias" or "procedural irregularity" as a routine mechanism for obtaining the tribunal's internal communications.

16. Deliberation Confidentiality and Arbitrator Bias

This is one of the most difficult areas.

Imagine that a party learns that its appointed arbitrator disagreed strongly with the majority.

It might seek:

emails between the arbitrators;

draft awards;

voting records;

internal memoranda;

comments concerning the parties;

correspondence about the evidence.

Ordinarily, these remain confidential.

However, suppose the dissenting arbitrator alleges:

"The majority refused to allow me to participate in deliberations."

That is fundamentally different.

The allegation concerns whether the tribunal properly functioned, rather than simply why the majority reached its conclusion.

Consequently, a court may investigate the process without opening the entire deliberative record.

17. Dissenting Opinions

A dissent presents a particularly delicate issue.

A dissenting arbitrator is generally entitled to state:

the result he or she considers correct;

the legal reasons for disagreement;

the factual findings considered erroneous;

the procedural reasons for dissent.

But a dissent should ordinarily not reveal confidential tribunal communications.

For example, this is ordinarily permissible:

"I disagree with the majority because I consider the limitation clause enforceable."

But this is problematic:

"Arbitrator A initially agreed with me but changed his position after Arbitrator B threatened to resign."

The second statement exposes internal deliberations.

Noble China demonstrates the seriousness with which courts can treat disclosure by a dissenting arbitrator. (vLex)

18. Tribunal Secretaries and Assistants

Deliberation confidentiality also raises questions regarding tribunal secretaries.

A tribunal may legitimately use a secretary for:

administrative assistance;

hearing logistics;

document organisation;

procedural correspondence;

transcription coordination;

basic research, where permitted.

But the arbitrators cannot delegate their core adjudicative function.

The secretary should not effectively become a fourth arbitrator.

Consequently, confidentiality cannot be used to conceal substantive delegation.

The Yukos-related proceedings demonstrate why courts distinguish legitimate administrative assistance from substantive participation in decision-making.

19. Electronic Deliberations

Modern arbitration makes the doctrine increasingly complicated.

Tribunals commonly deliberate through:

encrypted email;

Microsoft Teams;

Zoom;

institutional platforms;

shared document systems;

electronic draft awards;

messaging platforms.

A tribunal should therefore adopt strict internal protocols.

Good practice

Arbitrators should:

maintain a dedicated tribunal email account;

avoid discussing deliberations with outsiders;

restrict access to draft awards;

use secure document repositories;

ensure tribunal assistants understand confidentiality;

avoid unnecessary copying of institutional staff;

retain deliberative materials securely;

distinguish administrative communications from deliberative communications; and

preserve records where required by applicable law or institutional rules.

20. Confidentiality and Artificial Intelligence

The issue has become particularly important with AI-assisted arbitration.

An arbitrator should be extremely cautious about uploading confidential deliberative material to an external AI system.

For example, feeding an internal tribunal email into an external generative-AI platform could potentially:

disclose tribunal deliberations;

expose confidential case information;

compromise cybersecurity;

create uncertainty regarding data retention;

violate institutional rules; or

undermine the tribunal's confidentiality obligations.

The principle of deliberative secrecy therefore applies regardless of the technological medium.

The fact that information is processed digitally does not make it less confidential.

21. Indian Arbitration Context

For India-seated arbitrations, confidentiality must also be considered alongside Section 42A of the Arbitration and Conciliation Act, 1996.

Section 42A provides that the arbitrator, arbitral institution and parties must maintain confidentiality of arbitral proceedings, subject to the statutory exception concerning disclosure of the award where necessary for implementation and enforcement. (IBA)

However, Section 42A primarily addresses confidentiality of arbitral proceedings.

It does not expressly establish a detailed statutory code governing the internal deliberations of arbitrators.

Consequently, for deliberation confidentiality, one should also examine:

applicable institutional rules;

the arbitration agreement;

procedural orders;

principles of natural justice;

judicial precedent concerning arbitral independence;

the applicable law of the seat; and

the circumstances in which a court is reviewing the award.

A recent Delhi High Court decision concerning Section 42A demonstrates the courts' willingness to give meaningful effect to arbitration confidentiality and to prevent parties from circumventing the statutory protection by introducing material originating from another confidential arbitration. (Indian Kanoon)

22. Relationship With Setting Aside Proceedings

The most difficult question is:

Can a party obtain tribunal deliberations in order to challenge an award?

The general answer is:

Normally, no.

A setting-aside proceeding is not ordinarily an invitation for the court to reconstruct the tribunal's thought process.

The court normally examines the award and the arbitration record according to the applicable statutory grounds.

Disclosure of deliberations should therefore not become a substitute for ordinary judicial review.

But disclosure may become possible where:

the tribunal never properly deliberated;

an arbitrator was excluded;

there was corruption;

there was serious misconduct;

the decision was effectively made by an unauthorised person;

an arbitrator's participation was fundamentally compromised; or

an objective procedural fact cannot otherwise be established.

The court should seek the least intrusive means of investigating the allegation.

23. Proportionality in Disclosure

Even where an exception is established, disclosure need not be unlimited.

A court can potentially:

order disclosure of a narrowly defined document;

inspect material privately;

redact substantive deliberations;

allow evidence concerning objective procedural facts only;

prohibit questioning about mental processes;

restrict disclosure to the court rather than the parties; or

use affidavits instead of oral testimony.

This approach preserves as much confidentiality as possible while allowing legitimate judicial supervision.

The Dobish approach of in-camera review is an example of this controlled methodology. (eLitigation)

24. What Is Normally Protected?

The following are ordinarily protected:

25. What May Be Disclosed in Exceptional Circumstances?

Potentially disclosable information includes:

The critical question is not simply whether the information was created during deliberations. The court examines what the evidence is being used to establish.

26. Six Key Case Laws — Consolidated Principles

Thus, there is considerably more than six authorities supporting the modern doctrine. The central authorities are CZT v CZU, P v Q, Duke of Buccleuch and Noble China.

27. Practical Test for Courts

When faced with an application for tribunal deliberations, a court should ideally ask:

Step 1 — What material is sought?

Is it:

a final award?

a draft award?

emails?

minutes?

voting records?

procedural communications?

Step 2 — What is the applicant trying to establish?

Is the purpose to challenge:

the tribunal's reasoning; or

the integrity of the process?

Step 3 — Is the information objectively verifiable?

If yes, disclosure may be more defensible.

Step 4 — Is the request really an attempt to investigate the arbitrators' thought processes?

If yes, it should ordinarily fail.

Step 5 — How serious is the alleged misconduct?

Routine disagreement is insufficient.

Allegations involving corruption, exclusion of an arbitrator, or fundamental procedural misconduct are substantially different.

Step 6 — Is there a less intrusive method?

The court should prefer:

redaction;

in-camera inspection;

limited disclosure;

targeted testimony.

Step 7 — Does the interest of justice outweigh deliberative secrecy?

Only in exceptional circumstances should the balance favour disclosure.

28. Important Distinction: Confidentiality Does Not Mean Immunity

A tribunal cannot rely upon deliberation confidentiality to obtain absolute immunity from scrutiny.

There is a fundamental difference between:

"The court cannot ask me why I decided the case."

and:

"The court cannot investigate whether I participated in the decision at all."

The first proposition is strongly protected.

The second may be reviewable.

This distinction reconciles two competing values:

Finality and arbitral independence
with
Due process and integrity of the arbitral process.

29. Consequences of Breaching Deliberation Confidentiality

An arbitrator who improperly discloses deliberations may face:

A. Procedural consequences

The court may refuse to admit the disclosed material.

B. Evidentiary consequences

Evidence derived from improper disclosure may be excluded or given limited weight.

C. Challenge/removal consequences

Serious disclosure may demonstrate:

lack of impartiality;

failure to comply with arbitral duties;

misconduct; or

improper alignment with a party.

D. Cost consequences

A court or tribunal may impose adverse costs consequences.

E. Institutional consequences

Institutional rules may provide sanctions or other measures.

F. Award consequences

Only sufficiently serious misconduct affecting the integrity of the arbitration is likely to threaten the award itself.

30. The Central Principle

The modern international arbitration position can be reduced to the following rule:

Tribunal deliberations are presumptively confidential, and courts should not ordinarily permit parties to penetrate the tribunal's internal reasoning. However, confidentiality does not protect objectively ascertainable procedural misconduct or exceptionally serious allegations that threaten the integrity of the arbitral process.

The distinction between substantive deliberation and procedural integrity is therefore decisive.

A party cannot ordinarily obtain an arbitrator's private communications merely because it believes the award is wrong. But if the party can demonstrate a credible basis for alleging that the tribunal did not function as a tribunal, the court may, in the rarest cases, look behind the confidentiality barrier.