Field studies have been conducted to measure the characteristics of representative motions of current production seat from Isringhausen and the vibration characteristics of one typical articulated on-road truck. These data have been used in subsequent work packages for reproduction in the laboratory, as inputs to the mathematical models, and to define the range of test conditions applicable to the development of a testing method. The data have also been used during dynamic simulation for development of a completely new vertical and horizontal suspension technology. Follow up field studies have been performed to evaluate the differences between the old and modified seat.