Final answer:
The Individuals with Disabilities Education Act (IDEA) mandates functional assessment for students whose behavior interferes with their learning, ensuring tailored educational services through IEPs.
Step-by-step explanation:
The education legislation that requires that functional assessment be conducted for students whose behavior interferes with learning is the Individuals with Disabilities Education Act (IDEA). Initially passed as the Education for All Handicapped Children Act in 1975 and later renamed to IDEA in 1990, this act ensures that children with disabilities receive tailored educational services through individualized education plans (IEPs). IDEA focuses on providing an appropriate education for students with disabilities and encompasses the requirement for functional behavioral assessments when behaviors impede learning.