As was said above, you could talk about the specific HR case study you did- for example, asylum seekers, child soldiers, etc. Under that, you could discuss both the reform which has occurred in national and international law, with UN Treaties/Conventions probably being a pertinent example there. (e.g. UN Refugee Convention of 1951 relating to the rights of Asylum Seekers)
Another path you could take is discussing law reform domestically- e.g. the Toonen Case of 1994 (I can;t remember the exact year, but it was in the 90s!) and how that has assisted in protecting the HR's of Australian citizens.
