The result of decades of research into the history of Goju-ryu, "The History of Karate" is based on information Morio Higaonna gathered while training as a young student at the Garden Dojo of Chojun Miyagi, on hundreds of hours of interviews he conducted with senior Okinawan karateka, students, friends and relatives of both Chojun Miyagi and Kanryo Higaonna, and on personal research he carried out in China.