This document outlines a methodology for assessing the capacity of anti-corruption agencies. It defines corruption prevention and lists the key functions of such agencies, including policy advice, coordination, legislation, international cooperation, research, training, awareness raising, civil society participation, and enforcement. The methodology evaluates agencies' ability to carry out these functions based on their enabling environment, organization, mission/strategy, business processes, and human resource management. It provides guidelines for analyzing agencies' corruption prevention capacities.