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Uncertainties and risks underpinning environmental complexities have undermined lots of assumptions and delivery methods of large industrial projects and have lessened their efficiency and effectiveness. In the literature, selecting proper project delivery method in complex situations still lacks attention, and existing relevant studies have been also conducted based on “the first order of project management”, in which the degree and extent of uncertainties and environmental complexities are considered normal and prevalent. Based on the recent scientific and managerial paradigms such as “the second order of project management”, it is necessary to fulfil required revisions in existing models and solutions, utilizing a novel comprehension and vision to the environment. The main aim of this article is proposing an appropriate method for industrial projects delivery which are planned and conducted in environmental complex situations (and especially high uncertainties as subsequent of situations). This study shows that usual Design and Build method (EPC/TK) – with maximum transferring of risks to contractor – does not satisfy executing large industrial projects, and it should be improved through correction of basics and application of innovative tools and techniques. Flexibility Increasing, sharing risk among parties, supporting problem solving approach, etc. in delivery method form the basis and ground for proposed Design and Build method in this article. This research has utilized a qualitative research methodology, incorporating the Grounded Theory method (of Glitzer’s emerging design type) to identify uncertainties, risks, and the proposed mechanisms for flexible Design and Build delivery method.

Keywords: Project Delivery System, Design Build, Complexity, High Uncertainty

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