This Practice Description is an evidence-based practice for students with disabilities based on four methodologically sound group studies with random assignment across 197 students with disabilities and four methodologically sound single subject studies across 17 students with disabilities.  It is also a research-based practice for students with learning disabilities based on two methodologically sound group experimental studies with random assignment and two methodologically sound single subject studies across 41 participants with learning disabilities, as well as a research-based practice for students with intellectual disabilities based on two methodologically sound single subject studies across nine participants with intellectual disabilities.

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