The document provides terms of reference for a study on commune/sangkat planning and budgeting for social services in Cambodia. The study aims to analyze expenditure trends and identify factors that promote or hamper social service delivery, with a focus on vulnerable groups. It will examine demand for services, participation opportunities, and barriers facing communes. The methodology includes a desk review, key informant interviews, quantitative surveys of households and commune officials in a representative sample of at least 10% of communes. The study will produce recommendations to improve inclusive local governance and enhance participation of the poor and vulnerable in decision-making.