Ensuring Transparency in Investor-State Dispute Resolution under UNCITRAL Arbitration Rules

This policy brief, prepared by the Center for International Environmental Law (CIEL) and the International Institute for Sustainable Development (IISD), outlines recommendations for UNCITRAL Working Group II to increase transparency in investor-state dispute resolution. The authors argue that existing UNCITRAL arbitration rules are designed for private commercial disputes and fail to ensure the openness required for cases involving state responsibilities and human rights. They propose the creation of a specific annex to the UNCITRAL arbitration rules that would mandate public notice of arbitrations, the publication of tribunal documents, open hearings, and the acceptance of amicus curiae submissions.

• The 1976 and 2010 UNCITRAL arbitration rules are insufficient for investor-state disputes because they were designed for general commercial arbitrations between private parties and can actually prevent the disclosure of information. Specifically, these rules allow a single party to block the publication of an award or the holding of open hearings, and they lack a mechanism to make the existence of disputes public.
• CIEL and IISD recommend that the optimal way to ensure transparency is to develop specific rules integrated into the UNCITRAL arbitration rules, possibly as an annex. This approach is viewed as more effective than non-binding guidelines or model clauses because it promotes the rule of law, good governance, and the human right to access information.
• The authors argue that new transparency rules must apply to both existing and future treaties to be substantively meaningful. They note that there were 2,750 bilateral investment treaties (BITs) in force as of the document's context, with 82 more concluded in 2009. They suggest that the Working Group should ensure that Article 1(2) of the 2010 UNCITRAL Rules does not limit the application of new transparency provisions to existing treaties.
• To achieve harmonization of law, the authors suggest a systematic approach to publishing non-confidential decisions and awards. They state that current disclosure under UNCITRAL rules is random and incomplete, which increases uncertainty regarding the interpretation of standard investment treaty provisions.
• The proposed transparency annex includes three primary content requirements: first, public access to information (including notices of arbitration, tribunal composition, and all submitted/issued documents) subject to redaction of privileged data; second, hearings that are open to the public via in-person attendance, closed-circuit broadcast, or web casting; and third, a mechanism for amicus curiae submissions from non-disputing states or interested entities.
• The authors cite the Arbitration Institute of the Stockholm Chamber of Commerce (SCC) as a precedent for updating procedural rules. They note that the SCC has produced three versions of arbitration rules since 1999, using associated notes to ensure changes apply to any arbitration commenced on or after the adoption date, regardless of whether the dispute is commercial or treaty-based.

APA

International Institute for Sustainable Development (2011). Ensuring Transparency in Investor-State Dispute Resolution under UNCITRAL Arbitration Rules. https://www.iisd.org/system/files/publications/ensuring_transparency.pdf

Chicago

International Institute for Sustainable Development. Ensuring Transparency in Investor-State Dispute Resolution under UNCITRAL Arbitration Rules. 2011. https://www.iisd.org/system/files/publications/ensuring_transparency.pdf.

Wikipedia

{{cite report |author=International Institute for Sustainable Development |title=Ensuring Transparency in Investor-State Dispute Resolution under UNCITRAL Arbitration Rules |date=February 2011 |url=https://www.iisd.org/system/files/publications/ensuring_transparency.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{internationalinstituteforsustainabledevelopment2011ensuring, author = {{International Institute for Sustainable Development}}, title = {{Ensuring Transparency in Investor-State Dispute Resolution under UNCITRAL Arbitration Rules}}, institution = {International Institute for Sustainable Development}, year = {2011}, month = feb, url = {https://www.iisd.org/system/files/publications/ensuring_transparency.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }