“At the IAAF Council Meeting on 26 November, changes to the Rio 2016 Olympic Games entry standards in 17 events were approved.
The International Olympic Committee have since been notified.
In April 2015, the IAAF Council approved the entry standards but allowed for a review following the IAAF World Championships Beijing 2015 where a similar system of qualification and similar standards were used.
Resulting from the experience of these championships, the Technical Delegates proposed some amendments to the Rio 2016 Olympic Games entry standards, which have been accepted by all parties.
The aim is to have more athletes achieving the standard and therefore, to get closer to the target number of participants.
Details of the qualification system (a pdf file) and revised standards can be found here.”
SA has updated its Rio 2016 Olympic Games page here.