skating season, there were three segments in ice dance competitions: the compulsory dance (CD), the original dance (OD), and the free dance (FD). In 2010, the ISU voted to change the competition format by eliminating the CD and the OD and adding the new short dance (SD) segment to the competition schedule. In 2018, the ISU voted to rename the short dance to the rhythm dance (RD). Ice dance has required elements that competitors must perform and that make up a well-balanced ice dance program. They include the dance lift, the dance spin, the step sequence, twizzles, and choreographic elements. These must be performed in specific ways, as described in published communications by the ISU, unless otherwise specified. Each year the ISU publishes a list specifying the points that can be deducted from performance scores for various reasons, including falls, interruptions, and violations of the rules concerning time, music, and clothing. History Beginnings Ice dance, like pair skating, has its roots in the "combined skating" developed in the 19th century by skating clubs and organizations and in recreational social skating. Couples and friends would skate waltzes, marches, and other social dances together. According to writer Ellyn Kestnbaum, ice dance began with late 19th-century attempts by the Viennese and British to create ballroom-style performances on ice skates. However, figure skating historian James Hines argues that ice dance had its beginnings in hand-in-hand skating, a short-lived but popular discipline of figure skating in England in the 1890s; many of the positions used in modern ice dance can be traced back to hand-in-hand skating. The first steps in ice dance were similar to those used in ballroom dancing, so unlike modern ice dance, skaters tended to keep both feet on the ice most of the time, without the "long and flowing edges associated with graceful figure skating". In the late 1800s, American Jackson Haines, known as "the Father of Figure Skating", brought his style of skating to Europe. He taught people in Vienna how to dance on the ice, both singly and with partners. Capitalizing on the popularity of the waltz in Vienna, Haines introduced the American waltz, a simple four-step sequence, each step lasting one beat of music, repeated as the partners moved in a circular pattern. By the 1880s, it and the Jackson Haines waltz, a variation of the American waltz, were among the most popular ice dances. Other popular ice