Originally from Comparison of International Arbitration Rules - Sixth Edition

Comparison of International Arbitration Rules of ICC, AAA/ICDR, LCIA, SCC, ICSID, UNCITRAL, and CPR 
- A Chart of Parallel Provisions - 

CONSTITUTION OF THE ARBITRAL TRIBUNAL 
Consolidation
Number of Arbitrators
Nationality/Qualifications of Arbitrators
Disclosure by Arbitrators 
Appointment of Arbitrators
Challenge of Arbitrators 
Replacement of Arbitrators
Truncated Tribunals
Compensation of Arbitrators
Communications Between Parties and Arbitrators
Liability of Arbitrators/Arbitral Institutions