This paper displays standardized measurements to examine the skin conductance level (SCL) as an index for the sympathetic nervous system’s activity considering a possible standardization of personal variability.SCL measurements were performed at baseline, Cold-Pressor-Tests and Stroop Tests for 15 subjects and inter- and intra-individual mean SCL values were examined. The logarithmic representation displays a high inter-individual variability, denoted by a high fluctuation range of the absolute values and SCL amplitudes. A standardization of inter-individuality could not be achieved by the applied methods (range correction and z-transformation). For the relative intra-individual comparison of the stress situation to the baseline, a method of correction for the determination of the real effect of sympathetic activation was established. EDA should be combined with other parameters of the ANS for a more precise evaluation of stress situations in the context of changes in blood pressure.