A method of identifying the kinetic mechanism based on the shape or asymmetry of TG and DTG curves is outlined. The asymmetry is described, both qualitatively and quantitatively. The qualitative approach separates the various kinetic equations into three groups by their characteristic onset and final temperatures. The quantitative approach utilizes parameters such as alpha(max) and half-width pertaining to the DTG curve. Examples of selecting the appropriate kinetic equation using the proposed methods are given.