Historically, only amateurs were allowed to qualify for the Olympic Games and in 1962, the IOC issued the Eligibility rules which specified that persons receiving remuneration and other material advantages for participation in sport were not eligible to compete in the Olympic Games.[1] However, the concept of amateur sport developed over time,[65] moving by the end of the 1980s towards professionalisation.[65] Respecting the Olympic principles, the ISU rules made a difference in treatment of amateur and professional skaters wishing to qualify for the Olympic Games.[65] In 1986, the limitations imposed on professional skaters were removed and the categories of "eligible" and "ineligible" persons were introduced to replace the concepts of "amateurs" and "professionals".[65] In 1998, Eligibility rules established a comprehensive pre-authorisation system by stipulating that eligible skaters could only take part in competitions approved by the ISU, and conducted under the ISU Regulations by ISU-approved officials.[65] Under the 2014 Eligibility rules, the person who breached the Eligibility rules could not be reinstated.