The Center for Integration of IDEA Data (CIID) is an Office of Special Education Programs (OSEP)-funded technical assistance (TA) center helping state education agencies (SEAs) to integrate their Individuals with Disabilities Education Act (IDEA) data with statewide longitudinal data systems (SLDS). Data integration increases the value of education data to program administrators, policy makers, and others by permitting the seamless use of data from various programs and sectors. To understand the status of IDEA data integration and to inform technical assistance activities, CIID designed and administered a Data Integration Assessment (DIA) to 60 SEAs in spring 2015. The findings presented in this document reflect the status of IDEA Part B data integration in the 50 SEAs that completed the DIA. [The Center for the Integration of IDEA Data (CIID) is one of the centers in the Technical Assistance and Dissemination Network (TA&D Network) funded by the Office of Special Education Programs (OSEP).]