IEP Glossary · RTI / MTSS

Response to Intervention: What It Is and How Schools Use It to Delay Evaluations

Response to Intervention, also called RTI or MTSS (Multi-Tiered System of Supports), is a framework schools use to provide increasingly intensive support to struggling students before referring them for special education. The theory is sound. The implementation is often used as a gate, not a bridge. This guide explains what RTI is, what parents’ rights are within the process, and when you should stop waiting for it to run its course.

Meghan Moore, BCBA, M.A. Special Education

Founder, Mama Moore Advocacy · Updated April 6, 2026

The Three Tiers of RTI

RTI operates on a tiered model, with each tier representing a more intensive level of support. The intent is that students who don’t respond adequately to support at one tier are moved to a more intensive level, and that data collected along the way informs whether a special education referral is warranted.

Tier 1: High-quality core instruction for all students, paired with universal screening several times per year to identify students at risk. Most students should succeed with Tier 1 alone.
Tier 2: Targeted small-group interventions, typically delivered three to four times per week in groups of three to five students. Progress is monitored every two weeks. Students who don’t respond move to Tier 3.
Tier 3: Intensive individualized intervention with frequent progress monitoring. This is the tier closest to what special education looks like, and the tier where many schools stall, keeping children in intensive intervention indefinitely rather than referring them for evaluation.

The RTI-to-Special Education Pipeline

RTI data is supposed to inform special education referrals. Children who do not respond to Tier 3 intervention despite fidelity of implementation are, in many cases, candidates for a special education evaluation. The data collected throughout the RTI process, universal screening scores, progress monitoring charts, intervention logs, becomes part of the evaluation record.

The problem is that schools sometimes use RTI as indefinite intervention without ever referring for evaluation. A child can spend years in Tier 2 or Tier 3, cycling through interventions, with no progress and no evaluation. This is a misuse of the framework. RTI is supposed to be a bridge to special education for children who need it, not a barrier.

“Insufficient response to intervention” is data. It does not mean the intervention failed. It means the child may have a disability that requires specially designed instruction, not just more of the same support.

Your Rights Within RTI

Parents have meaningful rights throughout the RTI process that many schools do not proactively share.

You have the right to request a special education evaluation at any time, in writing, regardless of what tier your child is in or how long they have been in RTI
You have the right to see progress monitoring data, ask for it regularly
You have the right to know which interventions are being used and whether they are evidence-based
You have the right to be informed if your child is placed in a more intensive tier
You have the right to request an IEP meeting even if your child is still in RTI

When to Stop Waiting and Request an Evaluation

There is no fixed rule for when to request an evaluation, but these are clear signals that it is time to stop waiting:

Your child has been in Tier 2 or Tier 3 intervention for a full school year with limited or no progress
You have concerns that go beyond what RTI is designed to address, behavioral, social-emotional, communication, or processing needs
The school has been suggesting evaluation informally in conversations but no one has formally initiated the process
Your child’s private provider, pediatrician, or psychologist has recommended a special education evaluation

How to Request an Evaluation While in RTI

The request should be in writing. Here is language you can adapt:

“I am requesting a comprehensive special education evaluation for [child’s name]. I understand that participation in a response to intervention process does not delay or replace this right under IDEA. Please confirm receipt of this request and provide the required consent to evaluate paperwork within the required timeline.”

Send the request by email so you have a timestamp and a record. Keep a copy. In North Carolina, the school has 90 calendar days from the date you sign consent to complete the evaluation. The clock starts when you sign, not when you send the request, but the written request starts the conversation and creates a record.

Questions About RTI and Special Education Evaluation?

If your child has been in RTI for a year or more with no evaluation referral, Meghan can help you understand your options and draft a written request.

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What is Response to Intervention (RTI)?

RTI is a multi-tiered support framework that provides all students with high-quality core instruction (Tier 1), targeted small-group interventions for those who struggle (Tier 2), and intensive individualized intervention for those who don’t respond to Tier 2 (Tier 3). The data collected at each tier is supposed to inform special education referrals. In North Carolina, this framework is called MTSS (Multi-Tiered System of Supports).

Can the school make me wait for RTI to finish before evaluating my child?

No. IDEA explicitly states that the use of a response to intervention process does not delay or deny a parent’s right to request an evaluation for special education. If you submit a written evaluation request, the school cannot tell you your child needs to complete RTI first. The school may use RTI data as part of the evaluation, but they cannot require you to wait for it.

What should I do if my child has been in RTI for more than two years with no referral for evaluation?

Submit a written evaluation request. Include a reference to IDEA’s prohibition on using RTI to delay evaluation. The school has 90 days in NC to complete the evaluation after you sign consent. Two or more years of documented insufficient response to intervention is itself data that supports an evaluation and, in many cases, eligibility.