The influence of pressure on the shape of both TG and controlled transformation rate thermal analysis (CRTA) traces is theoretically and experimentally illustrated. It is shown that this shape can be explained on the basis of kinetic considerations and consequently thermoanalytical data can be used to perform kinetic analysis of solid state reactions contrary to Paulik’s statement. However it has been shown that CRTA traces are more sensitive than conventional non-isothermal curves to the effect of pressure of the gases self-generated in the reaction. This may be considered as an interesting argument to explain the advantages of the CRTA technique for discriminating between overlapping processes.