Fusion

Fusion is a 60-lesson, Tier 2 first grade mathematics intervention aimed at building students' proficiency with critical concepts and skills of whole number, specifically for students at risk for mathematics learning disabilities. The intervention addresses mathematical content from two strands of the Common Core State Standards for Mathematics: Operations and Algebraic Thinking, and Number and Operations in Base Ten. Fusion is delivered in 30-minute, small group formats (either two or five students per interventionist), five days per week for approximately 12 weeks. The program uses scripted lessons incorporating explicit and systematic instruction, concrete-representational-abstract framework, mathematical models (base-ten blocks, number lines, place value charts), and frequent student practice opportunities with timely academic feedback. All interventionists participated in two 4-hour professional development workshops delivered by project staff prior to implementation, and received on average two coaching visits during implementation.