Ensuring a robust and resilient health system involves policy actions which need to be implemented based on the best available evidence. This requires health systems to be monitored regularly to build on their strengths and to overcome any apparent shortcomings. In order to assist in that process, this volume, a collaboration between the World Health Organization and the European Observatory on Health Systems and Policies, presents a new framework to support monitoring of health system performance, with a focus on detailed conceptual links between health system functions and overall system goals. This HSPA framework for Universal Health Coverage thus represents a comprehensive attempt to address fundamental questions regarding regular assessment of health systems, including health system boundaries, component elements and outcomes. In this book, each of the health system function chapters outlines the purpose of the function, the sub-functions that enable it to carry out the key activities necessary to fulfil its purpose, as well as the assessment areas and proposed indicative measures to evaluate how well a system performs. The framework will thus assist policy-makers in understanding possible origins or impact of poor performance on a particular health system outcome, triggering more in-depth analysis.