TX 75083-3836, U.S.A., fax 01-972-952-9435. Abstract Field development profitability is a function of many income and expense factors such as capital expenditures (CAPEX), operating expenditures (OPEX), production rate, product price, frequency of component failures and intervention vessel expenses. Component failures reduce the field total production rate and increase OPEX. The losses are directly drawn from the bottom line. Regardless of the chosen concept, the ability to efficiently keep production wells on stream is one of the most important factors determining field economic performance. A strategy on how to manage the Intervention, Maintenance and Repair (IMR) activities is therefore of utmost importance.