The structural relaxation process in styrene-acrylonitrile copolymer has been characterized by means of differential scanning calorimetry (DSC) experiments. The results in the form of heat capacity, c(p)(T), curves are analyzed using a model for the evolution of the configurational entropy during the process recently proposed by the authors.(11,12) The model simulation allows one to determine the enthalpy( or entropy) structural relaxation times and the beta parameter of the Kohlrausch-Williams-Watts equation characterizing the width of the distribution of relaxation times. This material parameters are compared with their analogues determined from the dielectric and dynamic-mechanical relaxation processes.