The document summarizes a shared measurement system used by the Mekelle Woreda Water, Sanitation and Hygiene Alliance (MWA) in Ethiopia. The MWA, comprised of 5 NGO members and 4 local partners, developed common monitoring policies, strategies and indicators to foster learning and improvement. Key aspects of the shared system included: - Collecting output and outcome data using standardized tools across all partners - Establishing 'core' indicators to monitor functionality of water systems, access to water and sanitation facilities, and hygiene behaviors - Conducting routine monitoring of water schemes, communities, schools and health facilities - Using data reflection exercises to prompt discussion of challenges and solutions