This package of materials is intended to support countries in developing (or strengthening) national schemes for regulatory auditing of water safety plans. Topics addressed include audit mandates and drivers, standardized audit criteria, auditor qualification and selection processes, financing and other mechanisms for audit functionality and sustainability. The materials are intended to facilitate a stakeholder workshop to discuss the ‘key factors and principles’ for establishing a successful and sustainable audit programme, the output of which is a detailed action plan for the development (or advancement) of a context-appropriate national audit scheme.