The development of internal combustion engines is driven by two forces: the need for increased performances and most important of all the regulation for emissions reduction. Thanks to electronic control, in recent years engines have known spectacular progression in those two areas, but also a spectacular increase in complexity, especially for software. With the current high level of complexity rigorous processes are not enough to guarantee the quality. This is why RENAULT has launched the EMS 2010 (Engine Management System) project to build the standardization of the software structure with the support of its suppliers, especially the support of SIEMENS VDO. This article presents the main specificities of EMS 2010 software development through two parts. The first part introduces the EMS 2010 software architecture, its principles and main notions, and ends with a comparison with AUTOSAR. The second part goes through the technical particularities of the different steps of EMS 2010 software development from the specification of a module to its integration into a complete software.