LEVEL	REQUIREMENTS
International Umpire (IU)	An active umpire with at least two years experience as a National Umpire. Must be nominated to the ITTF by USA Table Tennis and pass an ITTF-given exam.
National Umpire (NU)	Awarded to umpires who pass a written and oral exam, have been a Regional Umpire for a minimum of one year, meet necessary experience qualifications and are recommended by USATT Officials Committee.
Regional Umpire (RU)	Awarded to umpires who pass a written and oral exam, have been a Club Umpire for a minimum of one year and meet necessary experience qualifications.
Club Umpire (CU)	The first umpire level that is earned by taking a written exam and being evaluated by a Tournament Referee (who is at least a Regional Umpire).
Tournament Referee	All International, National or Regional Umpires are considered Tournament Referees.
International Referee (IR)	Certified by the ITTF. Must be a USATT-certified National Referee for at least two years and be recommended by the USATT Officials Committee.
National Referee (NR)	Must be an ITTF-certified International Umpire for at least two years, be approved by the USATT Officials Committee and pass a three-part oral and written test.
An asterisk (*) indicates that the official is Wheelchair Certified.