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In the present investigation, a numerical model of side impact dummy (DOT-SID) is developed using TNO's MADYMO-3D multi-body features. During the model construction phases, relevant dummy components are individually modeled and are verified against empirical test results. The completed DOT-SID model is then integrated into a padded impactor model to simulate secondary-impact. Computations are run for several input force-deflection distributions, in conjunction with other parameters. From the results, occupant responses to various thoracic input are quantitatively sought, and the effectiveness of the MADYMO DOT-SID model as a vehicle development tool is assessed.