Rank in Judo are ranked in ascending numerical order. The ninth ("kudan") and tenth degree black belt ("jūdan") and, theoretically, those higher, have no formal requirements. Only 15 individuals have been promoted to the rank of Kōdōkan 10th dan. On January 6, 2006, three individuals were promoted to this rank simultaneously: Daigo Toshirō, Ichirō Abe, and Ōsawa Yoshimi. This is the most ever at the same time, and the first in 22 years. No one has ever been promoted to a rank higher than 10th "dan", but in theory the Judo rank system is not limited to 10 degrees of black belt. The
Judo in Canada aspects of Judo. The most complete history of Canadian Judo is Glynn Leyshon's "Judoka: the history of Judo in Canada" (1998). However, while Leyshon is Professor Emeritus of Kinesiology at the University of Western Ontario, "Judoka" is a popular history published by Judo Canada rather than an academic study. Anne Doré's article "Japanese-Canadian Sport History in the Fraser Valley: Judo and Baseball in the Interwar Years" (2002) and Joseph Svinth's book "Getting a Grip: Judo in the Nikkei Communities of the Pacific Northwest, 1900-1950" (2003) both address the history of Judo in British Columbia. Luiz Moraes' PhD thesis in Education