This special issue is devoted to recent studies of the Direct Instruction (DI) reading program and was inspired by several presentations at the Fort Worth Reading Symposium. This set of articles represent a significant contribution to the current national discussion about reading instruction and the utility of whole-school reform models in seeking to raise the achievement of students placed at risk of academic failure. With updates expected for at least a couple of these studies, the editors hope to begin a continuing dialogue among researchers regarding DI.

Different aspects of harmonic analysis, complex analysis, sampling theory, approximation theory and related topics are covered in this volume. The topics included are Fourier analysis, Pade approximation, dynamical systems and difference operators, splines, Christoffel functions, best approximation, discrepancy theory and Jackson-type theorems of approximation. The articles of this collection were originated from the International Conference in Approximation Theory, held in Savannah, GA in 2017, and organized by the editors of this volume.

This special issue is devoted to recent studies of the Direct Instruction (DI) reading program and was inspired by several presentations at the Fort Worth Reading Symposium. This set of articles represent a significant contribution to the current national discussion about reading instruction and the utility of whole-school reform models in seeking to raise the achievement of students placed at risk of academic failure. With updates expected for at least a couple of these studies, the editors hope to begin a continuing dialogue among researchers regarding DI.