The Project Management Institute estimates the current annual global investment in all capital projects and infrastructure is $12 trillion US, yet we have very little information on how and who initiated these investment decisions. Further, despite the creation of numerous programs and processes aimed at improving project success, completing projects on time and within budget still seems to elude project participants.Interviews were conducted with 21 executives in the upstream oil and gas industry to provide insight into how high profile capital project decisions were made. While capital projects were thought to be initiated by managers and follow a stage-gate process or are an output of the strategic planning process, a key finding is that these major projects were independently and intuitively conceived either by the CEO alone or by the CEO and other executives or board members. Four decision-making paths were modelled based on the type of opportunity: planned, opportunistic, combined, and one followed a rational decision-making process. Formal risk processes were not used in the decision-making process, nor were other resources such as consultants.These findings have implications for existing project management practices, including aligning risk perspectives and how risk is managed, the role of a stage-gate model, how projects are conceived and moved into the planning phase, and how projects are communicated within the executive team and organization. The findings also raise questions regarding broader external implications. If major decisions are made lll First and foremost to my supervisor and conunittee members for making this goal possible. To my supervisor Dr. Jergeas: thank-you for expanding my concept of project management and ensuring I had a more robust picture including the drivers within the oil and gas industry. Also, for making me think about the next steps and life after a PhD and suggesting there actually is a life (again) after a PhD! My sincere thanks for your willingness to 'step in' and ensure my transition was flawless. I appreciate your perspective and all of your support and suggestions over the last year.Dr. Hartman -we started this journey together and I am so glad we were able to finish together. Thank-you for shaking my foundation of what project management is, could be, and should be and for your deep passion for both the topic and your students. The monthly team meetings were a brilliant addition and helped me feel part of a team thus enforcing: you practice what you preach.Dr. Woiceshyn -for the challenge, for raising the bar and pushing me to be the best I could be, and always being there when I needed you. Your honesty and candor combined with your incredible talent, experience, and knowledge made me a better researcher and person. I always enjoyed our time together. Thank-you for everything: from taking me on until the very last suggestion; it has been a real pleasure and outstanding experience! V To my study team -Kara, Jason, Diana, Joseph, Tunde: they say no one understands w...