Flexible Infrastructure Design: A Real Options Reasoning Approach to Navigating Uncertainty in Large-Scale Projects

This study addresses the imperative of enhancing design flexibility in large-scale infrastructure projects to effectively navigate emerging uncertainties. Current appraisal methods often prioritize risk mitigation over uncertainty management, which hinders the implementation of flexible designs. Instead, this research explores the integration of design flexibility through real options reasoning (ROR) to create flexible infrastructures. As a result, a conceptual framework is proposed that draws from contemporary industrial practices such as modularization and project safeguards. Modularization, grounded in the alignment of functions and components, bolsters flexibility. Project safeguards, operationalized as passive or active measures, embed options in project outcomes. A proposed method emerges that synthesizes real options, modularization, and project safeguards into four guiding steps and nine helpful heuristics. These steps, enriched by heuristics, offer a structured approach to grasp, strategize, and implement design flexibility, transforming it from theory to impactful project management. Case-based and numerical validation was conducted to validate the proposed method. The proposed approach is illustrated through a case study of Heathrow Airport's £14 billion expansion. The research implications include the exploration of improved appraisal methods for large infrastructure projects, the advancement of ROR and application of heuristics in engineering management, and additional investigation into the integration of modularization and safeguards to enhance design flexibility in uncertain environments.