The document models and projects tertiary education participation rates in Australia out to 2031 under different scenarios. It analyzes historical enrollment and participation data for higher education and VET separately and combined. Scenarios include capping higher education enrollment growth and VET absorbing the excess demand. Projections show capping higher education growth would significantly decrease higher education and overall tertiary participation rates by 2031 without increased VET participation to compensate. Maintaining overall tertiary participation at current rates requires continued enrollment growth across both higher education and VET.