The crystallization kinetics of (InF3)(40)(ZnF2)(20)(BaF2)(15)(SrF2)(20)(GdF3)(2)(LaF3)(1)(DyF3)(2) glass was studied by differential scanning calorimetry. It was found that the two-parameter Sestak-Berggren equation gives a more quantitative description of the crystallization process than the Johnson-Mehl-Avrami model. The thermal stability criteria allowing comparison of different glass forming systems are discussed.