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In 1989, the EUROSID-1 was accepted in the European regulation ECE-R95. After a steady period of use, an upgraded version of this dummy: ES-2 is now considered as a step towards harmonization of side impact occupant regulations. The upgrades to the dummy include, amongst others, a modification of its torso back plate and a change in rib module guidance (piston-cylinder), especially to overcome anomalous rib deflection responses referred to as ""flat-top.'' Presented here are results of lateral and oblique pendulum tests, conducted on the EUROSID-1 and ES-2 to verify the modified torso back plate and to study the responses of three proposed rib module designs for ES-2. Particularly, rib deflections, rib VC responses, and thorax force-deflection responses are analyzed. The current study primarily addresses sensitivity of the ES-2 thorax to oblique loading.