This chapter introduces reader-response theory as a major development in literary theory over the past 30 years. It notes that reader-response criticism encompasses a wide range of perspectives on the roles of the reader, text, and social context in interpreting a work. While reader-response theory has had some influence on classroom practice, its impact has been less than other theories like process writing pedagogy. For reader-response theory to better shape instruction, more work is needed to translate theories into specific classroom techniques and illustrate them through examples of student work. A teacher's own response theories implicitly guide their teaching approaches.