Decision making: When you have enough information you should analyze the possibilities and scenarios and take the decisions that minimize the possibilities of fails assuring your success.
Control: Controlling the flow of your plan is vital in order to finds out your position in the project and to anticipate deviations and, if necessary, runs your contingency plans (Never forget to have contingency plans; you could analyze your historic information to reduce your uncertainty). “All project managers face problems on Monday mornings – good project managers are working on next Monday’ problems.” You cannot work on next Monday problems if you do not control how are your project going.