Using Maximus as an Integrated Production Modelling (IPM) tool, FEESA has performed numerous studies for major clients to investigate deliverability and production. Building a model from the reservoir to the facilities, we have looked at the effects of tubing and pipeline size, multiphase boosting, gaslift injection, subsea separation and various novel technologies such as hydrate slurry flow on the production rates achievable from a given configuration. By investigating a large number of system permutations, clients have been able to use the production profiles generated by Maximus to perform comparative economic selections, thus identifying the optimal configuration.