Specially Designed Instruction (SDI)
Instruction that has been adapted in content, methodology, or delivery to address the unique needs of your child. This is the core of what makes special education "special."
Federal rule: 34 CFR § 300.39 — Special education
Where SDI shows up in your IEP
SDI hides inside the services grid, in the row that says what the special education teacher actually does — not the minutes column, but the description beside it. That description should name what is being adapted: the content, the way it is taught, or how instruction is delivered. A room and a number alone is not an adaptation.
What to ask at the meeting
- What exactly is being adapted here — the content, the method, or the delivery?
- What would I see if I stood at the back of the room during that block?
- Which of these minutes are instruction, and which are supervision or check-ins?
Red flags
- The services row gives a room and a minutes figure with no instructional method named.
- Every child in the group carries the identical sentence in their own IEP.
- The adaptation described has no connection to the needs listed in present levels.
Example
Priya reads two grade levels below her class. Her IEP now says the reading block uses an explicit phonics program, taught in a group of three, with science text pre-taught beforehand. That sentence is the specially designed instruction; the thirty minutes beside it is only the container. Her father can finally tell whether a substitute is teaching the program.
Common questions
How is this different from an accommodation?
An accommodation changes the conditions around the learning — extra time, a quieter room, text read aloud. Specially designed instruction changes the teaching itself: what is taught, how it is taught, or how instruction is delivered. Most children have both, and both belong in the document.
Who is allowed to deliver it?
Qualified staff, and which license counts depends on your state's rules and the service in question. What matters on your side is that the IEP names the method and that whoever delivers it has been trained in the method the IEP describes.
Can it happen in the general education classroom?
Often it should. Adapting content, methodology or delivery does not require a separate room, and keeping instruction in class is usually the less restrictive choice. Ask how the adaptation travels into that setting so it does not thin out in a crowd.
Related Terms
Special Education
Specially designed instruction, at no cost to parents, to meet the unique needs of a child with a disability. This can include instruction in the classroom, at home, in hospitals, or other settings.
Individualized Education Program (IEP)
A written plan created for your child that describes their current abilities, sets learning goals, and lists the special education services they will receive. It's a legal document that the school must follow.
Accommodations
Changes in how your child learns or is tested that don't change what they learn. Examples include extra time on tests, preferential seating, audio books, or having instructions read aloud.
Modifications
Changes to what your child is expected to learn or demonstrate. Unlike accommodations, modifications change the content or expectations. Examples include a simplified reading level or fewer homework problems.
Want help understanding your child's IEP?
Check the Whole IEP — Free →This glossary is provided for informational purposes only and does not constitute legal advice. Definitions are simplified for parent-friendly understanding and may not reflect the full legal text. Consult a qualified attorney or advocate for advice about your specific situation.