The Individuals with Disabilities Education Act (IDEA) defines speech / language impairment as “a communication disorder such as stuttering, impaired articulation, language impairment or a voice impairment that adversely affects a student’s educational performance.”
Individuals with Disabilities Education Act, or IDEA, Pub.L. 101-476. (1990). Retrieved from https://www.law.cornell.edu/uscode/text/20/chapter-33