The purpose of collecting data on the various SPP Indicators is to assist states in monitoring implementation of IDEA and improving programs for school-age children with disabilities in the state. Seeing the relationship among the Indicators can be a daunting task and one that is difficult to visualize. The Part B Tree of Influence, developed by the Western Regional Resource Center (WRRC), is intended to help states with mapping how they would use the SPP Indicators for state improvement. This Tree of Influence serves as one model to show possible logical relationships among the Indicators and the (a) resources States invest, (b) activities implemented, and (c) benefits or changes that result.
