One line is all it takes.
A modification, filed under accommodations. Nobody catches it in the meeting. The parent doesn’t catch it. Half the time, the case manager doesn’t either — not until a file review turns a paperwork slip into a finding.
That’s the real cost of treating these three words as interchangeable.
They’re Not the Same Word, Said Three Ways
Accommodations change how a student gets at the material. The standard doesn’t move.
Modifications change what the student is expected to learn. The standard moves.
SDI isn’t either one. It’s the actual instruction targeting the disability — a category of its own, not a bigger accommodation.
Same section of the IEP. Same meeting. Three different legal categories, doing three different jobs.
One Word Decides Which One You’re Writing
Ask this before you write the line: does it change the standard, or the path to it?
Extended time on a reading test? Same passage, same questions, same grade-level expectation — just more time. That’s an accommodation.
Swap in a shorter passage at a lower reading level with fewer questions? The standard just changed. That’s a modification. Neither is better. They’re answering different questions about what a specific kid needs — but the IEP has to say which question you’re answering.
Same Setup, Two Different Documents
Here’s what that actually looks like on paper, side by side:
| Scenario | Accommodation | Modification |
|---|---|---|
| Reading comprehension test | Text read aloud, extended time | Shorter passage at a lower Lexile level, fewer questions |
| Math word problems | Calculator use, problems chunked one at a time | Reduced number of steps required, simplified numbers |
| Written response | Speech-to-text, sentence starters | Shorter required response length, lower complexity rubric |
| Class participation | Advance notice before being called on | Alternate, simplified participation task |
SDI Isn’t on This Table At All
That’s the mistake worth repeating: SDI doesn’t belong next to accommodations and modifications. It’s not bigger, smaller, or a hybrid of either.
It’s the instruction. Explicit decoding instruction for a reading disability. A taught self-regulation strategy for a behavior goal. Structured task-sequence practice for a transition goal. It’s goal-linked, it’s delivered, and it lives in the services section — not buried in a bullet list of supports.
Most kids with an academic or behavioral goal on your caseload need all three at once. That’s not overkill. That’s the job.
So before the next line goes in the document, ask the one question that decides everything else: standard, or path to the standard, or instruction?
Get that answer right, and the rewrite six months from now never has to happen.