A large gas Transmission System Operator (TSO) mandated E-Bridge to take and review the processes and the IT landscape in the field of network marketing, network service and network management and to identify optimization opportunities in the organization and in the system landscape. For this E-Bridge determines the possible alternative system and their application areas and costs and proposed adjustments to the organization. For the evaluation of the optimization options a consideration of the expected need for adaptation of the implementation of the network codes gas in the national regulation and its impact on the processes of a gas TSO takes places.