The characteristics of hand-arm vibration generated by the operation of power tools depends on the dynamics of the coupled hand-tool system. The assessment methodologies require repetitive measurements involving representative human subjects, test conditions and inter- and intra-subject variabilities. The applications of mechanical equivalent or biodynamic models of the human hand- arm system offer considerable potential to carry out assessments through analytical and experimental analyses. So the involvement of human subjects could be considerably reduced. If the statistical model considers the interaction between human hand-arm system and power tool, the statistical model could permit efficient evaluations of the tool design factors and vibration attenuation devices.