A simple but comprehensive analysis of the behavior to be expected from molecules whose Langmuirian adsorption on electrodes is controlled by both their rate of transfer to the surface and the rate of their transformation from the dissolved to the adsorbed state (and vice-versa) is presented. A ＇master equation＇ relating coverage and time is derived for cases where the mass transport of the adsorbate to the surface of the electrode is by linear diffusion (stationary electrode) or by convection-diffusion (rotating disk electrode). Five sub-cases are examined in which the influence of one (or a combination) of the factors controlling the adsorption is dominant. in each case, an easily computed, dimensionless, integral equation depending on only one parameter is derived. Corresponding calculated values of coverage vs. dimensionless time are presented and their shapes are discussed. A global description of the dynamics of adsorption for Langmuirian systems is thereby achieved.