A generalized experimental method that uses differential thermal analysis (DTA) has been developed for determining the nucleation rate (I), the crystal growth rate (U), and the concentration of quenched-in nuclei (N-q) in glasses. The method is applicable even for glasses, whose I and U curves (as a function of temperature) overlap to a considerable degree. Measuring I by the conventional method may yield an overestimated value for I if the chosen crystal growth temperature is within the region of overlap between I and U. When applied to a Na2O . 2CaO . 3SiO(2) glass, whose I and U curves are known to overlap considerably, the present DTA method yields values for I, U, and N-q that are in excellent agreement with the same values determined by the conventional methods.