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Scholars have become increasingly interested in what is often referred to as the instructional guidance infrastructure (IGI). Research has identified the characteristics of infrastructures that make them more or less influential in guiding teachers' instruction, such as alignment, authority, and prescriptiveness. Although these are important, a key question is whether and how IGIs work to influence teachers' beliefs and practices. We use new institutional theory to theorize relations between IGIs and teachers' beliefs about how students learn mathematics in two local school systems undergoing instructional reform. Based on new institutional theory, we explore how the three pillars of institutions--regulative, normative, and cultural-cognitive--worked in interaction to shape teachers' beliefs. In doing so, we develop a more comprehensive framework for examining IGIs and how they operate.

A central challenge for local education agencies (i.e., school districts in the United States) undergoing reform is to design systems that facilitate instructional improvement. At the core of these systems are educational infrastructures that bolster capacity building efforts and support teaching and leadership practices. Our goal for this special issue is to apply infrastructure as a framework to understand educational change processes across a variety of contexts and levels of the education system (i.e., state, district, school, classroom). Taken together, the articles in this issue reveal how infrastructure can support and/or constrain educational change to the extent that it is deeply connected to, taken up in, and/or transformed by teaching and leadership practice.