The document proposes a framework for linking the OECD Principles on Water Governance to impacts and outcomes. It relates the Principles, indicators of existence and a principles' quality, range, and sustainability to outcomes and the UN's Sustainable Development Goal 6 indicators. As an example, it assesses principle 5 on data and information in Tunisia. It finds the existence of water information systems but delays in groundwater data availability. It also finds data not easily understandable for non-specialists and institutions lacking strong mandates to sustainably fulfill tasks. The document argues this framework can help evaluate governance and identify measures to improve water governance and outcomes.