It explains the importance of high-quality socioeconomic surveys to strengthen project design, ensure robust due diligence, and inform evidence-based policies. Focusing on urban development and water projects, the guidebook discusses common mistakes made with socioeconomic surveys and provides good practices for implementing high quality face-to-face and digital surveys. It includes a standardized set of annotated questionnaires that consist of basic questions as well as expanded questions that enable a more robust understanding of project impacts.