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When designing Hybrid vehicles, engineers are facing important challenges due to increased interactions between the main vehicle subsystems and the diversification of both powertrain technologies and architectures. As an example, the range of hybrid transmissions includes serial hybrids, parallel and power split hybrids with variable hybridization rates from micro hybrids (start & go systems) to full hybrids. Because of the increasing number of interactions (mechanical, thermal, electrical, hydraulic, controls) between the vehicle subsystems, design analyses at component level proved to be insufficient to reach best performances and driving pleasure while at the same time decreasing fuel consumption and pollutant emissions. Today, automotive OEM design departments define targets for subsystems in early stage by taking into account individual vehicle attributes.