Mastering Reading Instruction is a continuation of the Early Reading Success Initiative, a professional development project whose purpose is to use scientific research in reading to support teachers in their knowledge and practice of effective reading instruction. This support is given through a systematic delivery system of professional development based on the National Reading Panel’s recommendations for comprehensive literacy instruction. In some cases, this professional development is supplemented with Haskins-trained mentors to support the implementation of the core components within the classroom. The goal of our work is to create ‘method-proof’ teachers – that is, teachers who can teach any child to read with any reading program.