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From the March/Micra released in 2002 to the LEAF EV today, on-board electronic systems have come to possess bigger software programs and more complexity in the transition to distributed high-speed ECU network systems. Meanwhile, faster time-to-market requirements have shortened the development period. If a conventional development process like the waterfall model is applied to develop a distributed ECU network system, numerous problems may occur at the vehicle testing stage that requires a lot of rework. To avoid that, we devised a new development methodology of distributed ECU systems and implemented it in our vehicle function development programs to improve development work quality across the entire spectrum of vehicle electronics. This development methodology consists of two principal elements. One is an Electronic Integration Platform (EIPF) and the other one is a Design-EIPF (D-EIPF).