1. A method of performing an oilfield operation of an oilfield, comprising: analyzing the oilfield operation to generate a decision tree comprising a first decision and a second decision, wherein a first outcome of the first decision dictates acquiring information relevant to the second decision; formulating a figure of merit of the oilfield operation according to the decision tree based on the information and uncertainties associated with the oilfield; determining a value of the figure of merit by modeling the oilfield operation using statistical sampling; and performing the oilfield operation upon making the first decision based on the value of the figure of merit.