To answer that question I'd be considering the way Justin the social worker treats the mental patients. Do you think he is demeaning? Why/why not?
I'd be looking at the set (or the description in the stage directions). Does it give a sense of isolation from the outside world? How?
Another thing you could try is comparing the social/political views of those inside the asylum (particularly Henry, Roy, Cherry and Ruth) to those outside (Nick/Lucy). How do they differ? Do you think having been isolated by society that the mental patients' views are outdated? (I'm not necessarily saying they are, that's something for you to decide!)
Finally, look at the way the Australian society of the 70s were treating the mentally ill. They isolated them in asylums and treated them poorly. There's lots of evidence in the play to support this. Many of the 'professionals' didn't know what they were doing. Even the average Australian was treating them badly, for example Nick. He makes his dislike for them clear at many times.
That's probably a good starting point. I must say, the question from the sheet was very oddly phrased! Or maybe I'm just tired...
edit: typos.