1.1. The First Claimant: The First Claimant is Chevron Corporation, a legal person organised under the laws of the United States of America, with its principal place of business at 6001 Bollinger Canyon Road, San Ramon, California 94583, U.S.A. (for ease of reference, herein called “Chevron”).

1.2. The Second Claimant: The Second Claimant is Texaco Petroleum Company, also a legal person organised under the laws of the United States of America, with its principal place of business at 6001 Bollinger Canyon Road, San Ramon, California 94583 U.S.A. (for ease of reference, herein called “TexPet”).

1.3. Until 2001, TexPet was a wholly owned indirect subsidiary of Texaco Inc., a legal person organised under the laws of the United States of America (for ease of reference, herein called “Texaco”); and thereafter, as from 2001, TexPet became and remains a wholly owned indirect subsidiary of Chevron.

1.4. The Claimants’ Legal Representatives: The Claimants are represented by: Mr. R. Doak Bishop; Mr. Wade M. Coriell and Ms. Isabel Fernández de la Cuesta (all of King & Spalding LLP, Houston); Mr. Edward G. Kehoe and Ms. Caline Mouawad (both of King & Spalding LLP, New York); and Professor James Crawford SC (of Matrix Chambers, London).

1.5. The Respondent: The Respondent is the Republic of Ecuador. It has owned and controlled at all material times Empresa Estatal de Petróleos de Ecuador (herein called “PetroEcuador”, known earlier as “CEPE”), a legal person formed under the laws of Ecuador.

1.6. The Respondent’s Legal Representatives: The Respondent is represented by Dr. Diego García Carrión (Procurador General del Estado), Dr. Álvaro Galindo C. (Director de Asuntos Internacionales y Arbitraje, Procuraduría General del Estado, until April 2011), Dr Francisco Grijalva (Director de Asuntos Internacionales y Arbitraje, Procuraduría General del Estado, as from April 2011), Mr. Bruno D. Leurent (Winston & Strawn LLP, Paris, until June 2011); Mr. C. MacNeil Mitchell (Winston & Strawn LLP, New York); Mr. Eric W. Bloom and Mr. Tomás Leonard (both of Winston & Strawn LLP, Washington, D.C.); Mr. Ricardo Ugarte (Winston & Strawn LLP, Chicago); and Professor Zachary Douglas and Mr. Luis González (both of Matrix Chambers, London).

1.7. Other Persons: The persons known as the “Lago Agro plaintiffs” in the legal proceedings in Ecuador known as the “Lago Agrio litigation” are not named parties to these arbitration proceedings; nor those known as the “Aguinda plaintiffs” in the earlier legal proceedings in the USA, known as the “Aguinda litigation”. These persons’ legal representatives and advisers in the USA and Ecuador are not parties to nor legally represented in these arbitration proceedings.