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Policymakers have focused on improving STEM outcomes for US high school students for over 50 years. Much of this focus has centered on improving the quality of STEM teachers, particularly in poor and minority schools. Few, if any, of these efforts have considered the importance of the content knowledge of those providing instructional leadership in schools – namely, principals and assistant principals. This chapter examines the percentage of school leaders with teacher certification in mathematics or science and the degree to which teacher and school leader turnover interrupts the leadership–teacher relationships. The study concludes relatively few school leaders have the content knowledge to provide deep instructional leadership. Moreover, the study finds combined teacher and school leader turnover greatly diminishes the sustained relationships between instructional leaders and teachers, particularly in lower-performing schools.

Teacher effectiveness and teacher quality have become the focus of intense international attention and national concern. Dozens of nations are implementing a diverse set of strategies that aim to improve the quality of education by improving the quality of teachers. These efforts have not been well coordinated, and as the authors in this volume show, core constructs of quality have not been well defined. In this introductory chapter, we discuss why teachers are now “under the microscope” of policymaker’s attention and elaborate how the chapters in this volume identify particularly fruitful avenues for further study. The assembled chapters address two complex questions: (1) what existing cross-national measures of teacher effectiveness and teacher quality are most promising and how can these be aligned to maximize their research potential? and (2) what core constructs of teacher quality or effectiveness are missing from the evidence-base, and how can cross-national comparative research help refine these? To investigate these questions, the chapters in this volume address different aspects of “quality.” While quality may be politically contested, there is a significant need to continue to articulate a truly global perspective on teacher quality. The authors look at a wide range of aspects of quality in order to advance thinking about teacher education, instructional quality and workforce or organizational conditions that affect quality; to analyze instruments, tools, or measures used to assess quality; and identify what measures need to be developed further. We also note how scholarly study of the spread of transnational teacher reforms has failed to keep pace with national policy changes regarding teacher quality, and advance a more general theory of the forces affecting national policymakers.