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Papua New Guinea's Constitution purports to adopt the principle of the separation of powers, enunciated in US jurisprudence in an environment where the three branches of government are indeed separate, the executive not being responsible to the legislature. In PNG as in Australia, the principle is in fact somewhat artificially defined simply to mean that the judiciary is independent from executive interference, as established by the English "Bill of Rights", 1689; however, the principle does not extend, as was established in Australia during the early years of the Australian federation, to preventing the courts from rendering advisory opinions to the executive; nor are there any implications with respect to the quasi-judicial function of administrative tribunals, also an issue at one time in Australia (see Separation of powers in Australia).