9. The Act makes no provision with respect to an appeal from a judgment of a single Judge of the Federal Court of Australia, except in s.50(2), which has the effect of requiring such an appeal to be dealt with in the Industrial Division of the Court. It is s.24(1)(a) of the Federal Court of Australia Act 1976 which gives the Court jurisdiction to hear and determine an appeal from a judgment of a single Judge of the Court. Sub-section (1A) provides that an appeal shall not be brought from an interlocutory judgment unless the Court or a Judge gives leave to appeal. Accordingly, counsel for the respondents argued that the application for leave to appeal is brought under the Federal Court of Australia Act 1976, not under the Act. This argument ignores the careful wording of s.347(1) of the Act. The prohibition on orders to pay costs is applicable not to a proceeding arising under the Act, but to a proceeding in a matter arising under the Act. There is much authority as to what constitutes a "matter" for the purposes of Chapter III of the Constitution. In substance, a "matter" is "a single justiciable controversy". See the joint judgment of Mason, Murphy, Brennan and Deane JJ. in Fencott v. Muller (1983) 152 CLR 570, at p 608. In the present case, the justiciable controversy between the parties embraces the question whether the respondents should perform and observe the rules of the Union by taking or refraining from certain actions in relation to the charges laid against the appellants. Orders for performance and observance of the rules accordingly are sought pursuant to s.209 of the Act. The alleged obligation to perform and observe the rules in that way is thus the "matter" upon which each proceeding between the present parties has been founded, namely the rule to show cause granted on 7th June, the interim orders made on 9th June, the appeal filed on 17th October, the motion for a stay of judgment filed on 25th October and the application for leave to appeal from the judgment of O'Loughlin J. Each of those steps is a "proceeding" as defined in s.4 of the Federal Court of Australia Act 1976. It is unnecessary at present to determine whether, in the absence of a similar definition in the Act, the word "proceeding" in s.347(1) should receive a similar interpretation. It is enough to say that, on any view, an application for leave to appeal, even from an interlocutory judgment, is a proceeding in its own right. That proceeding is, however, one in the same matter as were each of the earlier steps. It is plain that the matter arises under the Act. It involves the assertion of a right provided by s.209 of the Act. See Poulos v. Waltons Stores (Interstate) Ltd. (1986) 68 ALR 537, at p 543 in the judgment of Gray J., with whom Keely J. agreed.