After a brief overview of the state of thc art of kinetic study of solid state reactions, a new promising approach is described. Whilst details of such an approach have been previously reported, the model and its performances are presented here as an overall picture, including the evaluation of the heat transfer perturbations induced in both TG and DTA/DSC. A summary of the results obtained with CaC2O4.H2O is also reported, and a strategy is suggested, which should be used when facing the problem of such a kinetic evaluation or, in general, when processing data according to an assumed model.