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 the first decision comprises (a) a first outcome that dictates acquiring information relevant to the second decision and (b) a second outcome that dictates not acquiring the information, and wherein the second decision is influenced by the first outcome of the first decision, the second outcome of the first decision, and uncertainties associated with the oilfield; formulating a figure of merit of the oilfield operation according to the decision tree based on the information and the uncertainties associated with the oilfield; determining, by a processor, 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.