Risks constantly add complexity to the decision-making process in Oil & Gas industry. Risk register and risk matrices are common tools used to manage risks, but a list of risks cannot answer sponsors and stakeholders "How risky" question, especially those related to highly technical subjects. However, estimating the overall risk can address these concerns. Project Management Institute define overall risk as "the effect of uncertainty on the project as a whole, more than the sum of individual risks within a project…". The objective of this paper is to provide guidelines to estimate overall risk to make risk-informed decisions by modeling the effect of uncertainty in the achievement of objectives, providing an analysis that puts project stakeholders and sponsors in context, even in high complexity projects.

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