Some results on the kinetics and mechanism of catalytic processes obtained by use of a complex strategy, including combined stationary and nonstationary investigations, are discussed. The approach developed is grounded on exact kinetic studies by gradientless methods, isotopic exchange, IR spectroscopy of surface compounds, isotopic effects, adsorption measurements, investigations of transition processes, and catalyst deactivation. The reaction kinetics is related to the specificity in the mechanism of processes under investigation.