A national sport team at World Championships for Icelandic Horses can comprise of up to 7 rider/horse combinations and a reserve horse, a reserve rider or a reserve rider/horse combination. In addition, up to three extra eligible rider/horse combinations can be added to the team, provided that the extra riders are at least 16 years old and not more than 21 years old in the calendar year.
Only one horse per rider is allowed in the World Championships sport competitions. The rider/horse combination cannot be changed after the final entry. Excepted from this is when the reserve is entered in accordance with the rules.
The reigning World Champions are allowed to participate as World Champion at the succeeding World Championships with the same or another eligible horse. They must be officially entered by their national organisation, but will start in addition to the national team in the same team uniform. They are allowed to start in any discipline according to FIPO rules.
Horses that comply with the specific rule about eligible horses in the FEIF Sport Rules and Regulations, and that are 6 years or older in the calendar year, are eligible
Riders that comply with the specific rule about eligible riders in the general part of Sport Rules and Regulations, and which are 16 years or older in the calendar year are eligible.
A rider must have the nationality of the country he is representing or have had his permanent residence in the country he is representing for at least the previous year (counted back from the first day of World Championships).
Each participation country is invited to appoint one FEIF Licensed International Sport Judge for the sport competitions. Additional judges are appointed by a special committee.
A Chief Judge is appointed by the Board of FEIF upon recommendation by the Sport Committee at least 10 months before the start of the World Championships. At the same time a Deputy Chief Judge is appointed. The Chief Judge and the Deputy Chief Judge must be qualified as a FEIF International Sport judge.
World Championships are organised every two years (uneven years) in one of the member countries.