A method of performing oilfield operations for an oilfield having a subterranean formation with a reservoir therein is provided. The method involves generating a business analysis of the oilfield based on business inputs, generating an operational analysis of the oilfield based on operational inputs, and selectively integrating the business analysis with the operational analysis by using the operational outputs as at least a portion of the business inputs and by using the business outputs as at least a portion of the operational inputs to form an integrated oilfield analysis. The business analysis includes business outputs for characterizing the business impact of projects performed on the oilfield. The operational analysis includes operational outputs for characterizing the operational impact of projects performed on the oilfield. The integrated oilfield analysis includes integrated oilfield outputs for characterizing the business and operational impact of projects performed on the oilfield. The method may also involve developing an oilfield plan based on the integrated oilfield analysis and implementing the oilfield plan.