The document discusses multiple-severe disabilities, defined as concomitant impairments that cause severe educational needs that cannot be accommodated in special education programs for a single impairment. It notes that around 0.23% of students ages 6-21 nationally have multiple-severe disabilities. Some key characteristics of these students include problems transferring learning, limited communication skills, difficulties with memory, and needing services from multiple therapists. The document then outlines various teaching methods, challenges, and technologies that can help support students with multiple-severe disabilities.