A general method for the analysis of non-isothermal kinetic data is presented. The method is suitable for the analysis of data collected using time resolved powder diffraction and differential scanning calorimetry. The problems associated with previous methods are outlined and the new expression derived. An implementation strategy is also presented. The method is illustrated with the analysis of data collected as part of a real-time study of the I-->II phase transition in NH4Cl. Energies of activation of 400(80) and 450(90) kJ/mol were obtained for this transformation using time resolved powder diffraction and differential scanning calorimetry, respectively.