There is no formula for a fixed allocation of support staff.
Federation policy is that in primary schools, the minimum allocation should match that of the Teacher-Librarian 1:1. That is, whenever there is a Teacher-Librarian on duty that should be matched with a support staff person.
There is a Statement of Duties describing the duties expected of support staff. This is endorsed by the Union covering support staff and the Public Service Association. These duties are not the professional duties of Teacher-Librarians. Adequate support staff should be provided to ensure the Teacher-Librarian can fully attend to professional duties.
Refer to the section on Support Staff under "All Teacher Librarians"