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There was a major collection of publications between 1975 and 1985 that established fundamental theory and implementation of power system dynamic analysis. These results recognized the time-scale features of power systems and created strong modeling and analysis tools that are continuing to form the basis for simulation and analysis techniques today. This paper presents the fundamental time-scale properties of power system dynamic models that enabled many of these contributions. These properties have been utilized to create reduced-order dynamic models, efficient simulation algorithms, and to discover techniques for large-scale stability analysis.