Chapter 1. Decision-making: Concepts, Principles, and Uncertainty.- Chapter 2. Utility Theory.- Chapter 3. Probability.- Chapter 4. Probabilistic Evaluation of Uncertainties: Monte Carlo Method.- Chapter 5. Assessing the Importance of the Uncertainties: Design of Experiments.- Chapter 6. Fuzzy Logic.- Chapter 7. Uncertainty, data acquisition and Value of Information.- Chapter 8. The value of flexibility - Real Options.- Chapter 9. Case studies for the Value of Information and Flexibility in the oil and gas industry.