NAS was actually working until AsA prepared and posted a chart showing the old sector boundaries and frequencies. They did this without any pilot education .
and
NAS failed because Airservices without the approval of CASA undermined NAS and printed a special two sided chart showing ATC sector boundaries and then posted it to every pilot in Australia without any educational material on how the half wound back system was to work.
Just to correct this.
Airservices produced that chart
at the request of industry - RAPAC. And CASA agreed with it.
In fact Airservices covered the cost of production, printing and distribution (at a cost of some $200k I recall).