The two horizontal orthogonal ground reaction forces, medio-lateral (Fx) and antero-posterior (Fy), together with limb segment displacements, were recorded simultaneously during gait from 24 female subjects aged 18-29 years. Recordings were made for each subject barefoot and when wearing each of four different pairs of shoes: soft-soled, rigid-soled, medium-and high-heeled. The results showed a trend for increasing lateral stability with increasing heel height and decreasing ground contact area. This .was reflected in decreasing mean values for defined ground reaction force peaks in the medio-lateral direction at heel strike and at toe off. Limb segments displacements tended to increase with decreasing heel height and increasing shoe-ground contact area, being greatest when subjects were wearing pumps, i.e. flexible-soled, no-heeled shoes.