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The cadmium(Ⅱ)-glycinamide system was modeled and its stability constants were calculated by a unified mathematical treatment for experimental data obtained from ion selective electrode (ISE) and differential pulse polarography (DPP). It has been shown that very much the same experimental complex formation curve (ECFC) and theoretical complex formation curve (TCFC) could be given from both experimental techniques for the same experimental conditions, such as the same total ligand c(LT) and metal ion c(MT) concentrations. The combination of the two techniques is of many advantages as ISE can be performed at low a c (LT):c (MT) ratio and significantly higher c(MT), whereas DPP could be used well at larger the c(LT):c(MT) ratio and very low c(MT). This makes it possible to study a metal-ligand system in much broader range of experimental conditions that, in turn, provides us more data and information about the metal-ligand system of interest. Application of the unified mathematical treatment to the cadmium-glycinamide system in this paper, three new complexes MHL, ML3 and ML3(OH) as well as two complexes ML and ML2, reported in literatures, could be modeled and all their stability constants have been refined.