The present study used a rather new instrument, the Power/Control Scales (P/C-S) to examine its reliability, factor structure and concurrent and discriminant validity. It used a convenience sample of 158 couples - graduate and undergraduate students--and their partners--at the University of Minnesota. Power/Control Scales (P/C-S) was found to be a reliable instrument. However, in contrast to the original theoretical conceptualization, constructs of "Power" and "Control" were found to be highly correlated. Analysis of correlations between the original "Power" and "Control" scales and similar SCI scales and between the original "Power" and "Control" scales and dissimilar SCI provided some support for the concurrent and discriminant validity of the P/C-S. Exploratory factor analysis provided limited support for the proposed four-factor structure ("Power", "Control", "Self", "Other") of the instrument. Although data analysis resulted in a clear difference between "Self" and "Other" for all subsets of data , only factors 3 and 4 resulting from the Varimax rotation of the male data provided partial support for the existence of the separate constructs of "Power" and "Control". The subsets of "Power" and "Control" items in the newly identified factors seemed to represent constructs that are different form the originally defined "Power" and "Control" constructs. The new factors were labeled "Active/Enabling Influence" and "Passive/Inhibiting Influence". A model of analyzing "Power" and "Control" dynamics in close relationships was introduced based on a redefined constructs and possible practical implications of the proposed model were discussed.