It is stated that, for deduction of the kinetic equation of a heterogeneous catalytic process proceeding with a rate-determining step (RDS), it is necessary and sufficient to reveal the chemical nature of the RDS, composition of the surface intermediates, and stoichiometric number (SN) of the RDS. On the basis of calorimetric and adsorption methods applied to the Cu-Zn-containing catalysts reduced to a state identical to that occurring during the steady-state methanol synthesis from hydrogen and carbon oxides, three catalytic surfaces (S-1, S-2, and S-3) are specified and the individual steps of the steady-state process are studied. It is stated that CH3OH is produced at S-2 (the ZnO-component) from H-2 and CO2 by two routes N-1 and N-2 with RDSs of interaction between gaseous H-2 or CO2 and adsorbed CO2 or H-2, respectively, SN = 2 for each RDS, and the adsorbed intermediates are H-2, CO2, HCOH, HCOOH, and O-2; CO2 is produced at S, (the Cu-component approximated by Cu-4.OH2) through the shift-reaction; S-1 and S-2 are homogeneous in their adsorption properties. The causes of the absence of manifestation of the structural heterogeneity of catalysts in their adsorption and catalytic properties are considered.