Alignment has been defined as the extent to which curricular expectations and assessments are in agreement and work together to provide guidance for educators' efforts to facilitate students' progress toward desire academic outcomes. The Council of Chief State School Officers has identified three preferred models as frameworks for evaluating alignment: Webb's alignment model, the Surveys of Enacted Curriculum model, and the Achieve model. Each model consists of a series of indices that summarize or describe the general match or coherence between state standards, largescale assessments, and, in some cases, classroom instruction. This article provides an overview of these frameworks for evaluating alignment and their applications in educational practice and the research literature. After providing an introduction to the use of alignment to evaluate large-scale accountability systems, the article presents potential extensions of alignment for use with vulnerable populations (e.g., students with disabilities, preschoolers), individual students, and classroom teachers. These proposed applications can provide information for facilitating efforts to improve teachers' classroom instruction and students' educational achievement. C 2008 Wiley Periodicals, Inc.The current zeitgeist surrounding school reform and increased student achievement has created an environment where the curriculum, instruction, and assessments used in classrooms are under increased scrutiny. Accountability and large-scale assessment systems are based on a theory of action that assumes increased information about student achievement, coupled with salient incentives for increased performance (and corresponding punishments for lack of improvement), will motivate educators and produce improved student outcomes (Baker & Linn, 2002). Thus, the development and implementation of large-scale assessment and accountability programs are viewed by advocates of standards-based reform as one potential policy "lever" for improving classroom instruction and increasing equity across the educational system (Resnick, Rothman, Slattery, & Vranek, 2003). Many researchers, however, have suggested that the theory of action underlying these accountability systems may be overly simplistic in its understanding of educational improvement (Elmore, 2003;Fullan, 2003; O'Day, 2002).Overload and fragmentation are major barriers to the successful implementation of accountability and standards-based educational reform (Fullan, 1993(Fullan, , 2003. The content of instructional programs, state content standards, and assessments designed to measure student achievement may contradict each other, creating increasing levels of stress and pressure for educators and students. Accountability systems posit that to ensure effective schooling, the design and implementation of three components of the educational environment-curriculum, instruction, and assessment-must be coordinated (Elliott, Braden, & White, 2001;Webb, 1997Webb, , 2002. The degree to which these components work together to facili...