Contemporary research in Project Complexity suggests that Project Complexity is considered to be split between two major orientations: Organizational Complexity and Technological Complexity. This paper addresses the Technological aspect only, with special emphasis on Oil & Gas EPC projects. The aim of this paper is to define and illustrate the aspects of technological complexities and thus understand how to better manage them. Technological complexity might be a source of risk in project execution and needs to be properly managed to mitigate such a risk. Management process of technological complexities is similar to managing risks in projects in terms of procedural steps, but it is not the same. Technological complexities shall be tackled taking into consideration that they actually exist or do not exist rather than just having a probability of existence as is the case for traditional project risks. Contrary to what might be thought; technological sophistication is not a source of technological complexity, simply because if a certain technology is availing and is proven to be workable, no matter how sophisticated it is, its complexity level is considred to be low. This paper suggests a method of measuring technological complexity level for determining its real weight. Once the technological complexity is measured, proper level of attention can be given to it, including the allocation of necessary resources for managing it. Manging technological complexities in Oil & Gas EPC Projects shall be a joint effort between various project stakeholders, each according to his relevant scope. This paper also suggests some best practices for dealing with the ever growing technological complexities in Oil & Gas EPC Projects.

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