Response to Instruction and Intervention (RtII) in Pennsylvania refers to the use of a standards-aligned, comprehensive school improvement and/or multi-tiered system of support for implementing PA’s Standards Aligned System (SAS). Response to Instruction and Intervention rests on using a continuum of student performance data to continuously inform, monitor and improve student access and response to high-quality core and supplemental instruction/intervention. Through a multi-tiered system of support, implementers have a road map for facilitating systems change within the context of data-based decision-making and instructional matching. The intent of RtII is to improve learning as efficiently, effectively and equitably as possible for ALL students, including students with disabilities. Response to Instruction and Intervention is an “Every Ed” standards-aligned initiative.