was the basis for the official mark, rounded to the 10th of a second, depending on the rules then in place. The IAAF accepted records to the hundredth of a second starting in 1981. References General Women's record progression Men's record progression Specific Further reading Cordner Nelson and Roberto Quercetani, The Milers, Tafnews Press, 1985, 1500 metres World record 1500 metres