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There is considerable interest in expanding the capability of transient stability simulation to extend the time range of simulation and to add more power system components. The EPRI projects RP 745 and RP 1208 extended transient stability simulation to the mid-and long-term range. Additional power system components have added both high-speed dynamics (dc converters, generator subtransients) and very low speed effects (boiler dynamics, AGC controls). This paper addresses the interfacing of the wide range of time frames. A measure of the time frames is defined and evaluated for power system components in the EPRI RP 1208 Transient/Midterm Stability Program. The limitations and capabilities of stability simulation to properly support the range of time frames is discussed. This work has been supported, in part, by EPRI projects RP 745, RP 1208 and RP 1469.