Article 4
1. Within 30 days of the receipt of the notice of arbitration, the respondent shall communicate to the claimant a response to the notice of arbitration, which shall include:
(a) The name and contact details of each respondent;
(b) A response to the information set forth in the notice of
arbitration, pursuant to article 3, paragraphs 3 (c) to (g).
2. The response to the notice of arbitration may also include:
(a) Any plea that an arbitral tribunal to be constituted under these Rules lacks jurisdiction;
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(b) A proposal for the designation of an appointing authority referred to in article 6, paragraph 1;
(c) A proposal for the appointment of a sole arbitrator referred to in article 8, paragraph 1;
(d) Notification of the appointment of an arbitrator referred to in article 9 or 10;
(e) A brief description of counterclaims or claims for the purpose of a set-off, if any, including where relevant, an indication of the amounts involved, and the relief or remedy sought;
(f) A notice of arbitration in accordance with article 3 in case the respondent formulates a claim against a party to the arbitration agreement other than the claimant.
3. The constitution of the arbitral tribunal shall not be hindered by any controversy with respect to the respondent’s failure to communicate a response to the notice of arbitration, or an incomplete or late response to the notice of arbitration, which shall be finally resolved by the arbitral tribunal.
Representation and assistance
Article 5
Each party may be represented or assisted by persons chosen by it. The names and addresses of such persons must be communicated to all parties and to the arbitral tribunal. Such communication must specify whether the appointment is being made for purposes of representation or assistance. Where a person is to act as a representative of a party, the arbitral tribunal, on its own initiative or at the request of any party, may at any time require proof of authority granted to the representative in such a form as the arbitral tribunal may determine.
Designating and appointing authorities
Article 6
1. Unless the parties have already agreed on the choice of an appointing authority, a party may at any time propose the name or names of one or more institutions or persons, including the Secretary-General of the Permanent Court of Arbitration at The Hague (hereinafter called the “PCA”), one of whom would serve as appointing authority.
2. If all parties have not agreed on the choice of an appointing authority within 30 days after a proposal made in accordance
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with paragraph 1 has been received by all other parties, any party may request the Secretary-General of the PCA to designate the appointing authority.
3. Where these Rules provide for a period of time within which a party must refer a matter to an appointing authority and no appointing authority has been agreed on or designated, the period is suspended from the date on which a party initiates the procedure for agreeing on or designating an appointing authority until the date of such agreement or designation.
4. Except as referred to in article 41, paragraph 4, if the appointing authority refuses to act, or if it fails to appoint an arbitrator within 30 days after it receives a party’s request to do so, fails to act within any other period provided by these Rules, or fails to decide on a challenge to an arbitrator within a reasonable time after receiving a party’s request to do so, any party may request the Secretary- General of the PCA to designate a substitute appointing authority.
5. In exercising their functions under these Rules, the appointing authority and the Secretary-General of the PCA may require from any party and the arbitrators the information they deem necessary and they shall give the parties and, where appropriate, the arbitrators, an opportunity to present their views in any manner they consider appropriate. All such communications to and from the appointing authority and the Secretary-General of the PCA shall also be provided by the sender to all other parties.
6. When the appointing authority is requested to appoint an arbitrator pursuant to articles 8, 9, 10 or 14, the party making the request shall send to the appointing authority copies of the notice of arbitration and, if it exists, any response to the notice of arbitration.
7. The appointing authority shall have regard to such considerations as are likely to secure the appointment of an independent and impartial arbitrator and shall take into account the advisability of appointing an arbitrator of a nationality other than the nationalities of the parties.
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Section II. Composition of the arbitral tribunal
Number of arbitrators
Article 7
1. If the parties have not previously agreed on the number of arbitrators, and if within 30 days after the receipt by the respondent of the notice of arbitration the parties have not agreed that there shall be only one arbitrator, three arbitrators shall be appointed.
2. Notwithstanding paragraph 1, if no other parties have responded to a party’s proposal to appoint a sole arbitrator within the time limit provided for in paragraph 1 and the party or parties concerned have failed to appoint a second arbitrator in accordance with article 9 or 10, the appointing authority may, at the request of a party, appoint a sole arbitrator pursuant to the procedure provided for in article 8, paragraph 2, if it determines that, in view of the circumstances of the case, this is more appropriate.
Appointment of arbitrators (articles 8 to 10)
Article 8
1. If the parties have agreed that a sole arbitrator is to be appointed and if within 30 days after receipt by all other parties of a proposal for the appointment of a sole arbitrator the parties have not reached agreement thereon, a sole arbitrator shall, at the request of a party, be appointed by the appointing authority.
2. The appointing authority shall appoint the sole arbitrator as promptly as possible. In making the appointment, the appointing authority shall use the following list-procedure, unless the parties agree that the list-procedure should not be used or unless the appointing authority determines in its discretion that the use of the list-procedure is not appropriate for the case:
(a) The appointing authority shall communicate to each of the parties an identical list containing at least three names;
(b) Within 15 days after the receipt of this list, each party may return the list to the appointing authority after having deleted the name or names to which it objects
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and numbered the remaining names on the list in the order of its preference;
(c) After the expiration of the above period of time the appointing authority shall appoint the sole arbitrator from among the names approved on the lists returned to it and in accordance with the order of preference indicated by the parties;
(d) If for any reason the appointment cannot be made according to this procedure, the appointing authority may exercise its discretion in appointing the sole arbitrator.
Article 9
1. If three arbitrators are to be appointed, each party shall appoint one arbitrator. The two arbitrators thus appointed shall choose the third arbitrator who will act as the presiding arbitrator of the arbitral tribunal.
2. If within 30 days after the receipt of a party’s notification of the appointment of an arbitrator the other party has not notified the first party of the arbitrator it has appointed, the first party may request the appointing authority to appoint the second arbitrator.
3. If within 30 days after the appointment of the second arbitrator the two arbitrators have not agreed on the choice of the presiding arbitrator, the presiding arbitrator shall be appointed by the appointing authority in the same way as a sole arbitrator would be appointed under article 8.
Article 10
1. For the purposes of article 9, paragraph 1, where three arbitrators are to be appointed and there are multiple parties as claimant or as respondent, unless the parties have agreed to another method of appointm