A new methodology for the kinetic treatment of electrode reactions is presented. It is based on a theoretical analysis of the predictive capability of different mechanisms for the dependence of the polarisation resistance on the different operative variables. This procedure is applied in this case to the analysis of the chlorine electrode reaction on Ti/RuO2, for which the variation of the polarisation resistance on the activity of the chloride ions and on the partial pressure of the chlorine gas is derived. The descriptive capability of the mechanisms under discussion at present for this reaction is discussed and the theoretical dependences are compared with experimental data.