We usually associate risks with something negative, we also have the possibility that by taking a risk we could benefit from the event. In fact, the PMI explicitly defines risk as threats or opportunities.
Who can tell me which part of the PMI PMBOK talks about that?
If the question is specially about the PMI PMBOK, than this concept was part of the Guide to the Project Management Body of Knowledge (PMBOK Guide) published by the Project Management Institute (PMI) in December 2000, which states that “Project risk is an uncertain event or condition that, if it occurs, has a positive or a negative effect on a project objective … Project risk includes both threats to the project’s objectives and opportunities to improve on those objectives.” (Project Management Institute, 2000,127).The PMBOK Guide also defines risk management as “The systematic process of identifying, analyzing and responding to project risk. It includes maximizing … positive events and minimizing … adverse events.”