Understanding the Hierarchy of Evidence: A Framework for Health Research

This memo details the hierarchy of evidence framework, a tool used in health research to rank studies based on their ability to minimize bias and establish trustworthy conclusions. It reviews the strengths and weaknesses of different types of health research studies. Finally, it offers strategic guidance for applying the hierarchy to evidence-based health policymaking, emphasizing the need to balance study design with real-world feasibility and approaches for assessing recommendation strength.