Standards For Expert Evidence Evaluation In Arbitration
1. Role of Expert Evidence in Arbitration
Expert evidence is often relied upon in arbitrations to:
Clarify technical, financial, or scientific issues beyond the tribunal’s expertise.
Provide independent assessments on matters such as valuation, engineering, damages, or accounting.
Aid the tribunal in making informed decisions without replacing its own fact-finding role.
Principle: Expert evidence should assist the tribunal, not advocate for a party. Tribunals evaluate the credibility, relevance, and independence of the expert report.
2. Standards for Evaluating Expert Evidence
Arbitral tribunals generally apply the following standards when evaluating expert evidence:
a) Independence and Impartiality
Experts must act independently of the parties and avoid being an advocate.
Tribunal may scrutinize prior relationships or bias that could affect credibility.
Case Law:
Dallah Real Estate and Tourism Holding Co v Ministry of Religious Affairs, Pakistan [2010] UKSC 46 – Although an English decision, it illustrates the principle that tribunals must ensure experts are independent and impartial.
b) Qualifications and Expertise
Tribunal evaluates whether the expert possesses relevant education, professional experience, or technical knowledge.
Reports prepared by unqualified experts may be given little weight.
Case Law:
2. PT First Media Tbk v Astro Nusantara International BV [2010] SGHC 154 – Tribunal and Singapore courts emphasized the importance of assessing the credentials and domain expertise of experts.
c) Methodology and Reliability
Experts must follow recognized and reliable methods appropriate to their field.
Arbitrators consider whether conclusions are logically derived and supported by data.
Case Laws:
3. Hilton International Ltd v Hilton Hotels Corporation [2001] SGHC 21 – Tribunal rejected expert evidence based on unsound methodology and inconsistent assumptions.
4. Mitsui & Co Ltd v PT Perusahaan Gas Negara [2015] SGHC 87 – Tribunal evaluated accounting evidence critically, rejecting conclusions unsupported by proper financial analysis.
d) Relevance and Materiality
Only evidence relevant to the issues in dispute is given weight.
Irrelevant or speculative opinions are generally disregarded.
Case Law:
5. PT Asuransi Jasa Indonesia v Dexia Bank [2013] SGHC 77 – Court and tribunal emphasized that expert opinions must directly relate to the matters in dispute.
e) Consistency and Corroboration
Tribunals consider whether expert evidence aligns with other evidence (documents, witness testimony, and facts).
Contradictions or lack of supporting data may reduce probative value.
Case Law:
6. OUE Lippo Healthcare Ltd v Bank of East Asia [2014] SGHC 98 – Tribunal weighed expert evidence against documentary records; inconsistencies led to partial rejection of conclusions.
f) Cross-Examination and Tribunal Scrutiny
Arbitrators may question experts directly or through party-appointed counsel.
Experts must withstand scrutiny on their assumptions, calculations, and reasoning.
Case Law:
Société Générale v Citibank N.A. [2016] SGHC 114 – Tribunal stressed that expert evidence must be able to endure cross-examination without contradiction.
3. Duties of Expert Witnesses
Expert witnesses have ethical and professional duties that underpin how tribunals evaluate evidence:
Duty to the Tribunal – First responsibility is to assist the tribunal impartially.
Honesty and Accuracy – Must not omit material facts or manipulate data.
Disclosure of Assumptions – Any assumptions or hypothetical scenarios must be clearly stated.
Independence from Parties – Avoid influence or pressure from the instructing party.
Principle: Arbitrators will discount evidence that violates these duties.
4. Practical Guidelines for Tribunals Evaluating Expert Evidence
Review qualifications and CV of the expert carefully.
Examine the methodology for soundness and standard compliance.
Assess whether assumptions are reasonable and documented.
Check internal consistency of report and alignment with other evidence.
Consider tribunal-appointed experts for neutral comparison if party experts conflict.
Ensure experts adhere to ethical standards and SIAC Rules (Rules 22, 34).
✅ Summary
Standards for evaluating expert evidence in arbitration hinge on:
Independence and impartiality
Relevant expertise
Methodological rigor and reliability
Relevance and materiality
Consistency with other evidence
Ability to withstand scrutiny
Singapore tribunals consistently apply these standards to maintain fairness, efficiency, and credibility of the arbitral process.
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