Traditional multiphase flow simulations often include less rigorous boundary condition assumptions, because flowline models are commonly isolated from both upstream well inflow and downstream processing facilities. Such an approach can be even more unrealistic if the flowline model network is complicated for example, where connected with subsea processing equipment. Within this kind of system, changes in fluid behavior are even more sensitive to overall operability. A full field integrated simulation, which includes well inflow, subsea equipment (XTs and manifolds), subsea processing, flowlines, and/or arriving facilities, offers a more realistic solution. This paper describes the application and value of performing full field integrated simulations throughout the life-cycle phases of field development.The solver used for the simulation provides a powerful tool to screen design alternatives to identify the optimal field solution in a cost efficient way at an early design phase. In the detailed design phase the dynamic simulations using the same full field model can be performed to ensure system operability. Similarly, in the life-of-field operation phase, the same full field model can be used to perform real time metering and monitoring as well as Љlook-aheadЉ forecasting as part of an advisory system. This is usually instrumental for a challenging field production.As the simulation model evolves since early design phase until the life-of-field operation, it promotes a comprehensive continuity. ЉOne model one solutionЉ provides an effective design and operation tool. Such a tool is able to provide a wide range of information that is relevant across multidisciplinary teams.