(4)Where, underanappointment procedure agreed upon by theparties, (a) apartyfailstoactasrequired undersuchprocedure, or (b)theparties, ortwoarbitrators, areunabletoreachanagreement expected ofthemundersuchprocedure, or (c)athirdparty,including aninstitution, failstoperform anyfunction entrusted toitundersuchprocedure, anypartymayrequest thecourtorotherauthority specified inarticle 6totake thenecessary measure, unlesstheagreement ontheappointment procedure provides othermeansforsecuring theappointment. (5) Adecision on amatterentrusted byparagraph (3)or(4)ofthisarticle to thecourtorotherauthority specified inarticle 6shallbesubject tonoappeal. Thecourtorotherauthority, inappointing anarbitrator, shallhavedueregardto anyqualifications required ofthearbitrator bytheagreement oftheparties and tosuchconsiderations asarelikelytosecuretheappointment ofanindependent andimpartial arbitrator and,inthecaseofasoleorthirdarbitrator, shalltake intoaccount aswelltheadvisability ofappointing anarbitrator ofanationality otherthanthoseoftheparties. -84-Article 12.Grounds forchallenge (1)Whenapersonisapproached inconnection withhispossible appointment asan arbitrator, heshalldisclose anycircumstances likelytogiverisetojustifiable doubtsastohisimpartiality orindependence. Anarbitrator, fromthetimeofhis appointment andthroughout thearbitral proceedings, shallwithout delaydisclose anysuchcircumstances totheparties unlesstheyhavealready beeninformed of them by him. (2)Anarbitrator may bechallenged onlyifcircumstances existthatgiveriseto justifiable doubtsastohisimpartiality orindependence, orifhedoesnot possess qualifications agreedtobytheparties. Apartymaychallenge an arbitrator appointed byhim,orinwhoseappointment hehasparticipated, onlyfor reasons ofwhichhebecomes awareaftertheappointment hasbeenmade. Article 13.Challenge procedure (1)Theparties arefreetoagreeon aprocedure forchallenging anarbitrator, subject totheprovisions ofparagraph (3)ofthisarticle. (2)Failing suchagreement, apartywhointends tochallenge anarbitrator shall, withinfifteen daysafterbecoming awareoftheconstitution ofthearbitral tribunal orafterbecoming awareofanycircumstance referred toinarticle 12(2), sendawritten statement ofthereasons forthechallenge tothearbitral tribunal. Unlessthechallenged arbitrator withdraws fromhisofficeortheother partyagreestothechallenge, thearbitral tribunal shalldecideonthechallenge. (3)Ifachallenge underanyprocedure agreed upon by theparties orunderthe Procedure ofparagraph (2)ofthisarticle isnotsuccessful, thechallenging party mayrequest, withinthirtydaysafterhavingreceived noticeofthedecision rejecting thechallenge, thecourtorotherauthority specified inarticle6to decide onthechallenge, whichdecision shallbesubject tonoappeal; whilesucha requestispending, thearbitral tribunal, including thechallenged arbitrator, may continue thearbitral proceedings and make an award. Article 14.Failure orimpossibility toact ~(1)Ifanarbitrator becomes dejureordefactounabletoperform hisfunctions orforotherreasonsfailstoactwithout unduedelay,hismandate terminates ifhe withdraws fromhisofficeoriftheparties agreeonthetermination. Otherwise, ifacontroversy remains concerning anyofthesegrounds, anypartymayrequest the courtorotherauthority specified inarticle 6todecideonthetermination ofthe mandate, whichdecision shallbesubject tonoappeal. (2)If,underthisarticle orarticle 13(2),anarbitrator withdraws fromhis officeorapartyagreestothetermination ofthemandate ofanarbitrator, this doesnotimplyacceptance ofthevalidity ofanygroundreferred tointhisarticle orarticle 12(2). Article 15.Appointment ofsubstitute arbitrator Wherethemandate ofanarbitrator terminates underarticle 13or14orbecause of hiswithdrawal fromofficeforanyotherreasonorbecause oftherevocation ofhis mandate byagreement oftheparties orinanyothercaseoftermination ofhis mandate, asubstitute arbitrator shallbeappointed according totherulesthat wereapplicable totheappointment ofthearbitrator beingreplaced. -85-CHAPTER, IV.JURISDICTION OFARBITRAL TRIBUNAL Article 16.Competence ofarbitral tribunal. toruleonitsjurisdiction (1) The arbitral tribunal mayruleonitsownjurisdiction, including any objections withrespect totheexistence orvalidity ofthearbitration aqreement.
**Analysis**
This text appears to be related to the rules and procedures governing international arbitration, specifically in the context of commercial disputes. The language used is formal and technical, suggesting a focus on legal and regulatory issues. The text does not mention specific industries or sectors, but rather provides general guidelines for the appointment, challenge, and termination of arbitrators, as well as the jurisdiction of the arbitral tribunal.

**Category**
International trade