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1. If the Commission does not include a member of the nationality of a State which is party to a dispute referred to it under the provisions of Article 12 or Article 13, that State, or if there is more than one, each of those States, may choose a person to sit on the Commission as a member ad hoc.
2. The State thus choosing a member ad hoc shall have regard to the qualities required of members of the Commission by virtue of Article 2, paragraph 1, and Article 4, paragraphs 1 and 2. Any member ad hoc thus chosen shall be of the nationality of the State which chooses him or of a State Party to the Protocol, and shall serve in a personal capacity.
3. Should there be several States Parties to the dispute having the same interest they shall, for the purpose of choosing members ad hoc, be reckoned as one party only. The manner in which this provision shall be applied shall be determined by the Rules of Procedure of the Commission referred to in Article 11.