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Viscous Stirring involves multiple encounters of multiple objects over time, which lead to a wider spread of velocity distribution, which leads to an increase of eccentricity and inclination of objects.  Dynamical Friction involves gravitational encounters with masses of different velocities. Large mass objects are dragged by low mass objects, while low mass objects are gravitationally assisted by large mass objects. DF leads to a general decrease of velocity for large masses and an increase for low masses.  Ohtsuki & Stewart (2002, Icarus 155, 436-453, hereafter O&S) obtained evolution rates of eccentricity and inclination using Viscous Stirring and Dynamical Friction rates