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A joint initiative undertaken by UNIDROIT and the ICC Institute, the project combines UNIDROIT’s expertise in developing uniform law instruments and ICC’s expertise in investment arbitration and the elaboration of model clauses for international contracts. It aims to foster the modernisation and standardisation of international investment contracts, in light of the evolving landscape of investment law and arbitration.  

The draft Principles and Model Clauses for IICs are based on the UNIDROIT Principles on International Commercial Contracts (UPICC), which set out principles, commentaries and model clauses tailored to the specific characteristics of the investment contracts, with the goal of promoting greater legal certainty, a better balance between the interests of states and investors, and sustainable investment. 

The ICC Institute and UNIDROIT invite all stakeholders, including states, international organisations, businesses, arbitral institutions, associations, academics and practitioners, to review the draft and submit their comments to the UNIDROIT Secretariat via IICs-consultation@unidroit.orgnouvelle fenêtre by 15 September 2026 (midnight, Rome time). 

View more detailsnouvelle fenêtre on how to submit your comments and the project. 

Consult the project historynouvelle fenêtre for more information.