The book explains how to evaluate infrastructure projects using Cost–Benefit Analysis (CBA), combining welfare economics with the practical realities of public decision-making. Aimed at graduate students and practitioners, it treats infrastructure as both an economic good and a political choice, shaped by uncertainty, externalities, and distributional effects. It argues that CBA should guide real trade-offs—growth, equity, sustainability—rather than serve as a box-ticking exercise, and it pro-vides a step-by-step structure supported by applied cases.