This paper deals with responses of BIOSID and EUROSID I side impact dummies as regards biofidelity requirements set up by C22/SC12/WG5. Each dummy was subjected to a series of sled, impactor, and drop tests in order to assess the behavior of dummy segments such as the neck, shoulder, thorax, abdomen and pelvis. Besides the biofidelity evaluation, other dummy characteristics are discussed, i.e., repeatability and reproducibility. The main results of the present study confirm that both dummies, although showing better performance than their predecessors, still need to be further developed so that they could be used as a development and certification tool.