Since 2011 the National Center on Intensive Intervention (NCII) has worked to build the capacity of state and local education agency personnel, university faculty, practitioners and other stakeholders to support the implementation of intensive intervention in reading, mathematics, and behavior for students with severe and/or persistent learning and behavioral needs, often in the context of their multi-tiered system of supports (MTSS) or special education services. NCII’s approach to intensive intervention is data-based individualization (DBI), a research-based process that integrates the systematic use of assessment data, validated interventions, and intensification strategies.