Heptathlon consisting of the same events as the men's competition in a slightly different order, and the IAAF has begun keeping records for it, but the heptathlon remains the championship-level combined event for women. Nafissatou Thiam, representing Belgium, is the 2016 Olympic Gold Medallist and the 2017 World Champion. There is also a Tetradecathlon, which is a double heptathlon, consisting of 14 events, seven events per day. The heptathlon scoring system was devised by Dr Karl Ulbrich, a Viennese mathematician. The formulae are constructed so that, for each event, a designated "standard" performance (for example, approximately 1.82 m for the high
Combined events at the Olympics men's decathlon world record has had a strong link with the competition, with the Olympic gold medalist breaking the world record in 1928, 1932, 1936, 1952, 1972, 1976, and 1984. Five men have won two Olympic combined event titles. Bob Mathias, Daley Thompson and Ashton Eaton have all won back-to-back decathlon titles, Jim Thorpe won both the decathlon and pentathlon titles in 1912, and Eero Lehtonen won two Olympic pentathlon titles. Jackie Joyner-Kersee is the most successful athlete, having won two Olympic heptathlon titles and, with her further silver medal, is the only combined events competitor to have won three