The overall model of the form: d alpha/dt=(K' +K alpha(m))(1 -alpha)(n), known as Kamal's model, has been analysed in this work. Although it can describe well the isothermal DSC experiment, the statistical criteria does not allow fixing exactly the adjustable power exponents in the model. In turn, the overall "reaction order" varies in a large range at almost identical confidence limits. The model evaluated in isothermal DSC mode at different values of m and n has been tested. The test has not been found out reliable to describe the data at varying temperature. (C) 2010 Elsevier B.V. All rights reserved.