The system was approved at the IAAF Council meeting in Buenos Aires last week and includes details of the entry numbers for each discipline and the qualification timeline.
For the 10,000 metres, marathon, race walks, combined events and relays, the qualification period runs from January 1, 2019 to June 29, 2020.
For all other events, the qualification period runs from July 1, 2019 to June 29, 2020.
Athletes can qualify in one of two ways - either by virtue of their IAAF world ranking position at the end of the qualification period, or by achieving the entry standard within the qualification period.
Entry standards will be approved and published later this year, but will be set for the sole purpose of qualifying athletes with exceptional performances who are unable to qualify through the IAAF world rankings pathway.
Tokyo 2020 will open on July 24 with the athletics programme starting on July 31.(Insidethegames.biz)