Abstract A data base covering binary and ternary systems of metals is currently under development covering a wide variety of metallic systems. In the present case analytic descriptions of the Aluminum-Bismuth and Bismuth-Gallium systems were developed and combined with a previous description of the Aluminum-Gallium system to describe the Aluminum-Bismuth-Gallium system by means of the Muggianu Equation. Ternary isothermal sections were computed in this system and then compared with experimental measurements of the calorimetric properties and phase equilibria in this system.