Research on increasing teacher effectiveness is presented in this book. Chapter 1 outlines a framework for investigating and understanding teacher effectiveness, with attention to the following components: teacher and student characteristics; curriculum; classroom environment and management; teaching; and learning. Chapter 2 describes the two variables that are linked to student learning--opportunity to learn and academic work. Policies concerning these two variables lay the groundwork for increasing teacher effectiveness. Chapter 3 examines ways to create physically and psychologically appealing classrooms, and chapter 4 presents ways in which these classrooms can be organized to promote effective teaching and learning. Chapters 5 and 6 describe ways in which effective teachers structure their lessons and communicate with their students. Student learning as both a process of involvement and an outcome (success) is discussed in the seventh chapter. The final chapter offers strategies for increasing teacher effectiveness--overcoming reluctance to change and providing support for improvement efforts--and makes recommendations for policymakers and educational planners. One figure and one table are included. Appendices contain sample teacher evaluation instruments. (Contains 99 references.) (LMI)