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We review the microscopic theory of the mutual friction in superfluid 3 He. This theory suggests that the dynamics of vortices is governed by the interaction between the quasiparticles localized in the vortex core and excitations outside the vortex. The mutual friction parameters are determined by the ratio of the distance between the energy levels of quasiparticles localized in the vortex and the relaxation rate of these quasiparticles.