Final answer:
IDEA defines multiple disabilities as concomitant impairments that create severe educational needs that cannot be met by programs designed for just one impairment. Addressing the combination of disabilities is necessary to provide appropriate education to students with multiple disabilities.
Step-by-step explanation:
The Individuals with Disabilities Education Act (IDEA) defines multiple disabilities as concomitant impairments (such as intellectual disability-blindness or intellectual disability-orthopedic impairment), which cause such severe educational needs that they cannot be accommodated in special education programs solely for one of the impairments. The significance of mentioning concomitant impairments emphasizes that the combination of disabilities interact in such a way that creates unique challenges that cannot be addressed by programs targeting only one impairment. This is why IDEA considers addressing only one impairment insufficient for students with multiple disabilities. The impact on educational needs is substantial; students with multiple disabilities require tailored educational plans that consider the complexities of their combined impairments to ensure they have access to an appropriate education.
By understanding the impact of multiple disabilities on educational needs under IDEA, individuals can see the necessity of developing comprehensive educational plans that address all of a student's unique needs to provide the best opportunity for success in the educational environment.