Speech‑Language Impairment — What IDEA and Section 504 Mean for Schools and Families Introduction Speech‑language impairments (SLI) affect a child’s ability to communicate and can significantly interfere with learning, social interaction, and access to instruction.  Under the Individuals with Disabilities Education Act (IDEA), SLI is a recognized category for special education; Section 504 provides broader civil‑rights protections and accommodations when a communication impairment substantially limits a major life activity.  This article explains eligibility, referral and evaluation processes, common assessments, evidence‑based services, classroom accommodations and modifications, and parents’ procedural rights and entitlements. Legal Definitions and Frameworks IDEA: “Speech or language impairment” typically refers to communication disorders (articulation, fluency/stuttering, voice, and language disorders) that adversely affect educational performance and require special educ...