the four nations that win their World Group II ties will compete in the World Group I Play-Offs to determine relegation/promotion for the following year, as described above. Similarly the four nations that lose their World Group II ties will face winning nations from Group I Zonal competitions, in the World Group II Play-offs, to determine relegation/promotion. (The four nations that win their World Group II Play-offs will be in World Group II the following year, while the four losers will begin the next year in Group I Zonal events.) Once in the World Group or World Group II, four nations will be seeded in each. The decision as to which nations will be seeded is made by the BJK Cup Committee, according to the ITF BJK Cup Nations Ranking. At the levels below the World Group and World Group II, the BJK Cup nations compete in Zonal Competition events, which are split into three zones: The Americas Zone, the Asia/Oceania Zone and the Europe/Africa Zone. In each zone there are two groups, Group I being the higher and Group II the lower, except for the Europe/Africa Zone, which also has a Group III. Within the Group zonal regions, teams are split into pools and play against each other in a round robin format. The exact format of each Group event, and promotion and relegation between them, varies according to the number of participating teams. Two teams are always promoted from Europe/Africa Group I to that year's World Group II Play-Offs, while one team each go to the World Group II Play-Offs from Americas Group I and Asia/Oceania Zone Group I. Current structure This structure has been implemented since 2016. Ties In World Group and World Group II, and World Group and World Group II Play-off ties, each tie is contested in a best of five matches format, and is played across two days. On the first day there are two singles matches, and then the reverse singles matches take place on the following day. The final match is a doubles. In Zonal Groups I, II and III, ties are played over the best of three matches (two singles and a doubles). The First Round Ties in the World Group and World Group II are played on a home and away knock-out basis, and take place over a weekend in the early part of the year. World Group Semi-finals and