In 1984, the Hawke Government enacted the landmark Sex Discrimination Act, which eliminated discrimination on the grounds of sex within the workplace. In 1989, Hawke oversaw the gradual re-introduction of some tuition fees for university study, creating set up the Higher Education Contributions Scheme (HECS). Under the original HECS, a $1,800 fee was charged to all university students, and the Commonwealth paid the balance. A student could defer payment of this HECS amount and repay the debt through the tax system, when the student's income exceeds a threshold level. As part of the reforms, Colleges of Advanced Education entered the University sector by various means. by doing so, university places were able to be expanded. Further notable policy decisions taken during the Government's time in office included the public health campaign regarding HIV/AIDS, and Indigenous land rights reform, with an investigation of the idea of a treaty between Aborigines and the Government being launched, although the latter would be overtaken by events, notably the Mabo court decision.