A thermodynamic description of the Al-Ca-Sr system is carried out using the modified quasichemical model. The three binary systems Al-Ca, Al-Sr, and Ca-Sr have been re-optimised based on the experimental phase equilibria and thermodynamic properties available in the literature. Good agreement was obtained for the calculated binary phase diagrams and their thermodynamic properties. The established database of this system predicted one saddle point, one peritectic, seven quasi-peritectics, and two ternary eutectics. (C) 2007 Elsevier Ltd. All rights reserved.