What kinds of policy options do policy makers have to enhance the quality and delivery of education in schools? This chapter discusses the context, main issues and policies adopted across OECD countries to promote school improvement. School improvement policies refer to those that strengthen the delivery of education in schools to positively influence student achievement. They comprise policies to promote the development of adequate learning environments and relevant curriculum, effective school leaders and high-quality teachers.The chapter reviews policies adopted across OECD countries between 2008 and 2014 in a comparative approach, drawing mainly from the Education Policy Country Snapshots (), Education Policy Outlook Country Profiles, and OECD comparative and country-specific analysis on education systems. The reforms vary across countries, as they are influenced by context, traditions, institutional settings and specific national and regional challenges. These policies all aim to improve the quality of schools and instruction and have been grouped according to the different policy options and their scope.