This chapter provides an overview of decision support methodologies, with a focus on Multi-Criteria Analysis (MCA) and its application in infrastructure planning. It examines the structure, strengths, and limitations of key MCA methods and assesses their suitability for complex decision-making in the transport and logistics sectors. It also explores the evaluation techniques employed to support strategic choices, emphasising their role in reconciling technical, economic, and policy considerations. Finally, it reviews of contemporary MCA applications in transportation planning, drawing insights from global scientific literature to identify trends, challenges, and best practices in decision support frameworks.