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A planar eight accelerometer measurement system for determining the three dimensional motion of the pelvis during walking has been developed in this study. Literature reviews are given for: previous studies of pelvic motion, kinematic measurement systems and previous studies which used accelerometers to measure human locomotion activities. Equations for the eight accelerometer configuration are derived from the general equations of rigid body motion. The method of solving these equations for angular velocity, angular position and the translational acceleration, velocity and position is developed. The computer program used to process data collected in walking tests are explained. The mathematical techniques used to integrate the equations and to filter the data are discussed. The following pelvic motion parameters are produced as functions of time: angular velocity, angular position, translational acceleration, translational velocity and translational position. The results of experimental testing of the measurement method are presented. Graphical results for tests of seven male subjects walking barefoot, in shoes and carrying 13.6 Kg backpacks and of seven female subjects walking barefoot, in low heeled shoes and in high heeled shoes are presented. It is concluded that this accelerometer measurement method can measure three dimensional pelvic motion during human locomotion activities such as walking.