Internationally, Australia's tertiary education system, comprising the higher education and vocational education and training (VET) sectors, is highly regarded, with both sectors subject to ongoing national review and reforms. This paper explores in detail the multiple issues that lie at what might be termed the "boundaries and connections" between these sectors. The purpose of this occasional paper is twofold, the first being to provide a brief illustration and commentary on the relative trend change and potential trajectories of Australia's vocational education and training (VET) sector by comparison with the higher education sector. This provides the necessary context for the second objective, which is to explore in detail the multiple issues that lie at what might be described as the "boundaries and connections" between these two components of the tertiary education sector.