MTSS and RTI: A Teacher's Guide to Tiered Support

A fifth-grade student in your class is struggling with reading. You have tried small-group instruction, extra practice with decodable texts, and a seating change to reduce distractions. Progress is slow. The student reads 15 words per minute below the benchmark, and the gap is widening. You know something more structured is needed, but what exactly, and who decides? This is the question that Multi-Tiered System of Supports (MTSS) answers. For more on this topic, see Mtss vs rti. MTSS gives schools a decision-making framework for matching students to the right level of support based on data, not gut feeling. It replaces the old model of waiting for students to fail before acting.

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Evidence Overview

Chalkface Translator: research evidence in plain teacher language

Academic

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Evidence Rating: Load-Bearing Pillars

Emerging (d<0.2)

Promising (d 0.2-0.5)

Robust (d 0.5+)

Foundational (d 0.8+)

Evidence Overview by Structural Learning. Effect sizes converted to months of progress using the EEF formula.

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Key Takeaways

1. MTSS fundamentally shifts educational support from reactive to proactive, data-driven intervention. This framework moves beyond the "wait to fail" model, using systematic data collection to identify learners' needs early and match them to appropriate, evidence-based support tiers (Fuchs & Fuchs, 2006). It ensures that interventions are timely and tailored, preventing academic or behavioural gaps from widening.
2. Robust universal screening and continuous progress monitoring are non-negotiable for effective MTSS. These data collection methods provide essential insights into learner performance and response to intervention, guiding decisions about tier movement and intervention adjustments (Shinn, 2002). Without reliable and frequent data, the tiered support system cannot accurately identify needs or evaluate efficacy.
3. MTSS is a comprehensive system addressing academic, behavioural, and social-emotional needs comprehensiveally. While often associated with academic interventions, MTSS integrates support for behaviour and social-emotional learning, recognising their interconnectedness with academic success (Sugai & Horner, 2009). This integrated approach ensures that all barriers to learning are systematically addressed across the tiers.
4. Classroom teachers are pivotal in the successful implementation and fidelity of MTSS. Teachers are at the forefront of delivering Tier 1 universal instruction, identifying learners for screening, implementing Tier 2 interventions, and collecting crucial progress monitoring data (Batsche & Knoff, 1995). Their expertise and consistent application of evidence-based practices are fundamental to the system's efficacy.

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What Is MTSS?

MTSS gives learners varied help depending on how they respond to teaching. The National Center on RTI calls it prevention using tiered, proven methods. More information can be found on Response to Intervention RTI. ESSA (2015) names MTSS as a way to allocate resources, improving learner success.

MTSS is not a program you purchase. It is not a curriculum. It is a structure for making decisions about which students need what kind of help and when to change course if the help is not working. Schools that implement MTSS well use data at every decision point: screening data to identify who is at risk, progress monitoring data to track whether interventions are working, and diagnostic data to understand why a student is struggling.

MTSS addresses both learning and behaviour. Earlier models, like Response to Intervention, prioritised reading and maths (Daly et al., 2009). MTSS incorporates PBIS, social-emotional learning and attendance support. A learner with poor attendance may receive Tier 2 support despite academic success (Crone et al., 2010). Learners good at reading but struggling with organisation need self-regulation help (Sugai & Horner, 2006).

The practical result is that MTSS forces a school to ask two questions repeatedly: Is the core instruction working for most students? And for the students it is not working for, what is the most efficient next step? When those questions are answered with data rather than assumptions, schools allocate time and resources more precisely.

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MTSS vs RTI: What Changed?

IDEA reauthorised Response to Intervention in 2004. Schools once used IQ discrepancy to find learning disabilities. A learner needed an IQ/performance gap. Fletcher et al. (2007) criticised this "wait to fail" approach. Support arrived too late, they argued.

Researchers argued Response to Intervention (RTI) offered a new way. Schools screened all learners, providing instruction based on evidence (Al Otaiba, 2022). RTI identified learning difficulties by how learners responded (Fuchs, 2003; Vaughn, 2003). Those not responding to Tier 1 and 2 help likely had a learning difficulty.

MTSS builds on RTI, adding behaviour and social-emotional help. MTSS emphasises one joined-up system, unlike separate tracks (Sailor, 2009). The framework is school-wide prevention, not just special needs identification (Sugai & Horner, 2009). Many UK schools use MTSS, with RTI as the academic part (Batsche et al., 2005).

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The Three Tiers Explained

The tiered model is the structural core of MTSS. Each tier represents a level of instructional intensity. Students move between tiers based on data, not opinion. The percentages below are approximations; they describe what a well-functioning system looks like, not rigid quotas.

Tier 1: Universal Instruction (All Students)

Tier 1 is the classroom. Teachers provide learners with good core teaching, using evidence. Tier 1 teaching meets around 80% of learner needs in a good school (Burns et al., 2021).

Universal screening occurs three times yearly: autumn, winter, and spring. These quick tests show which learners perform below expected levels. If under 80% meet benchmarks, core teaching likely needs improvement. This distinction is key. Differentiation matters most in Tier 1: group learners flexibly, vary text levels, use graphic organisers, and teach skills explicitly.

A concrete example: A third-grade teacher uses a structured literacy program for all students. Phonics instruction is explicit and systematic. Students practice decoding with connected texts daily. The teacher screens all students in September using DIBELS and identifies six students reading below the 25th percentile. Those six students are flagged for closer monitoring and may move to Tier 2 if they do not respond to differentiated Tier 1 instruction over the next few weeks.

Tier 2: Targeted Interventions (Approximately 15% of Students)

Tier 2 provides small-group instruction in addition to Tier 1. This is not a replacement for core instruction. Students continue receiving Tier 1 teaching and get supplemental support on top of it. Groups are small, typically three to five students, and the intervention follows a standardized, evidence-based protocol.

Progress monitoring happens every one to two weeks. Interventions usually last 8 to 12 weeks; then the team checks learner progress. Tier 2 interventions target specific skill gaps, identified by assessments. These are not general tutoring sessions (Burns & Gibbons, 2008).

A concrete example: A fourth-grade student scores below benchmark on the winter reading fluency screening. She reads 62 words per minute; the benchmark is 90. The MTSS team places her in a Tier 2 group of four students. Three times per week for 30 minutes, a trained interventionist leads repeated reading practice using controlled-difficulty passages. The student's oral reading fluency is measured every two weeks using curriculum-based measurement probes. After eight weeks, the team reviews her progress graph. If she is on track to reach benchmark, the intervention continues. If not, the team discusses intensifying support.

Tier 3: Intensive, Individualized Interventions (Approximately 5% of Students)

Tier 3 is the most intensive level of support. Students receive one-on-one or very small group instruction (two to three students) at higher frequency and longer duration than Tier 2. Instruction is more explicit, more scaffolded, and often delivered by a specialist. Progress monitoring happens weekly.

If a learner struggles after 8-12 weeks of Tier 3 intervention, consider special education assessment. Tier 3 data then supports that assessment process (Batsche et al., 2005).

A concrete example: A second-grade student has received Tier 2 reading intervention for 10 weeks with minimal progress. He still confuses b/d, struggles to blend CVC words, and reads 18 words per minute. The MTSS team moves him to Tier 3. He now receives daily one-on-one Orton-Gillingham instruction with a reading specialist for 45 minutes. His working memory and phonological processing are assessed to better understand the underlying difficulty. Weekly progress monitoring tracks letter-sound fluency and word reading accuracy.

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Universal Screening: The Starting Point

Universal screening is the entry point for every MTSS decision. These are brief, standardized assessments given to all students three times per year: fall, winter, and spring. Their purpose is to identify students who are at risk of academic or behavioural difficulty before they fail.

Common screening tools include DIBELS (Active Indicators of Basic Early Literacy Skills), AIMSweb, MAP Growth, iReady, and Star Assessments. Each tool provides benchmark scores that indicate whether a student is on track, at some risk, or at high risk. A typical cut point is the 25th percentile: students scoring below this threshold are flagged for additional monitoring or Tier 2 support.

Screening is not diagnosis. A student who scores below benchmark on a fall screening has been identified as potentially at risk. The screening does not tell you why the student is struggling. It does not identify a learning disability. It simply raises a flag that says "look more closely at this student." The next step is progress monitoring, not labeling.

A practical example: A school screens all kindergarten students in September using DIBELS Next. The letter naming fluency subtest shows that 22 out of 25 students can name at least 40 letters per minute. Three students name fewer than 20. Those three students are not immediately placed in Tier 2. Instead, the teacher provides targeted letter-name practice within Tier 1 (small-group rotations during literacy block) and monitors their progress weekly for four weeks. Two of the three students respond and reach benchmark. One does not. That student moves to Tier 2.

Screening learners early avoids problems. Learners get support before catching up is too hard. Screening also reduces over-identification. Teachers' judgement alone is less accurate than tests, says Gersten et al., (2009).

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Progress Monitoring: How to Know If It Is Working

CBM helps measure learners' progress. After Tier 2 or 3 starts, progress monitoring becomes key data. Progress monitoring uses short, standard measures to track improvement over time (Deno, 1985; Fuchs & Deno, 1991).

The process works like this. The interventionist administers a one-minute reading probe (or a brief math computation probe) every one to two weeks. Each data point is plotted on a graph. The graph also includes an aimline: a straight line from the student's starting performance to the year-end goal, showing the rate of growth needed to reach benchmark by spring.

Use the three-data-point rule to guide decisions. If three data points are below the line, change the support (Johnston & Street, 2004). Try a different method, more frequent sessions, or smaller groups. Check that you are implementing the support as planned (Glover & Dibble, 2008). If three data points are above the line, the learner responds well. They might need less support (Burns & Gibbons, 2008).

Here is a practical example. Marcus, a third-grader, reads 45 words per minute in October. His spring benchmark goal is 90 words per minute. That is a 28-week window, so his aimline requires a gain of roughly 1.6 words per minute per week. After six weeks of Tier 2 intervention, Marcus has gained only 0.5 words per minute per week. His three most recent data points are 47, 48, and 48. All three fall below the aimline, which predicts he should be at 54 by now. The MTSS team meets and decides to increase intervention frequency from three to five sessions per week and to add a phonics component alongside fluency practice.

Rate of improvement (ROI) is the metric that makes this actionable. You calculate ROI by subtracting the baseline score from the most recent score and dividing by the number of weeks. Compare the student's ROI to grade-level peers. If peers are growing at 1.5 words per minute per week and the student is growing at 0.5, the gap is widening. If the student is growing at 2.0 words per minute per week, the gap is closing. This is the kind of data that formative assessment practices support: frequent, low-stakes measurement that directly informs the next instructional decision.

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Decision-Making at Each Tier

Tier transitions are data-driven decisions, not administrative conveniences. Each transition has specific criteria.

Tier 1 to Tier 2. A student scores below benchmark on universal screening and does not respond to differentiated instruction within Tier 1 over a reasonable period (typically four to six weeks of targeted support within the classroom). The classroom teacher documents what was tried and the student's response. The MTSS team reviews the data and places the student in a Tier 2 intervention group.

Tier 2 to Tier 3. A student has received 8 to 12 weeks of Tier 2 intervention delivered with fidelity, and progress monitoring data shows inadequate growth. Inadequate growth means the student's rate of improvement is not on track to close the gap with grade-level peers. The team considers whether the intervention was appropriate, whether it was delivered as designed, and whether diagnostic assessment is needed to better understand the student's specific difficulties. If the answers point toward more intensive support, the student moves to Tier 3.

Learners show insufficient progress after 8-12 weeks of Tier 3 help. The team documents interventions (like suggested by Jones, 2003), fidelity data, and progress monitoring. This evidence forms part of the special education referral (Smith, 2010).

Before increasing support, ensure interventions are delivered properly. Check if the current plan was implemented as intended (Gresham et al., 1993). A learner getting two sessions instead of four hasn't had Tier 2 support. Verifying this avoids wrongly increasing support levels.

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MTSS and Special Education

MTSS data helps but doesn't replace full special needs assessments. IDEA 2004 lets UK schools use RTI data to assess learning difficulties. Screening data and progress charts from MTSS become review evidence, as per IDEA 2004.

A critical legal point: a parent can request a special education evaluation at any time. The school cannot use MTSS as a reason to delay or deny evaluation. If a parent submits a written request for evaluation, the school has 60 days (or the timeline specified by state law) to complete the evaluation, regardless of where the student sits in the MTSS framework. The Office of Special Education Programs (OSEP) has clarified this repeatedly. MTSS is a general education framework for all students; it does not gatekeep access to special education.

Students who already have an Individualized Education Program (IEP) still participate in MTSS. Their IEP is, in effect, their Tier 3 plan. The specially designed instruction outlined in the IEP serves as the student's intensive intervention. Progress monitoring for IEP goals functions the same way as MTSS progress monitoring: regular data collection, graphed results, and team review.

MTSS paperwork aids learners with dyslexia or ADHD. It shows schools used research-based support before assessment. Documentation reveals successful and unsuccessful interventions for learners. This informs the evaluation team about needed individualised teaching.

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For International Readers: UK Equivalents

Readers outside the United States will recognise many MTSS principles under different names. In the UK, the equivalent framework is the Graduated Approach, outlined in the SEND Code of Practice (2015). The Graduated Approach uses a four-stage cycle: Assess, Plan, Do, Review (APDR). This cycle mirrors the MTSS problem-solving process: assess the student's needs, plan an intervention, deliver the intervention, and review whether it worked.

The tiered structure maps roughly as follows. Tier 1 in MTSS corresponds to Quality First Teaching in the UK: high-quality, differentiated classroom instruction that meets the needs of most learners. Tier 2 maps to SEN Support, where the class teacher and SENCO work together to plan and deliver targeted interventions for students who need additional help. Tier 3 corresponds to the Education, Health and Care Plan (EHCP), the most intensive level of support for students with significant and complex needs.

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US schools formalise tiered support with clear criteria and team decisions. UK schools use APDR more flexibly; the SENCO coordinates support, and teachers deliver it. Both systems aim to identify needs early, use proven interventions, monitor progress, and adapt. UK teachers can use the SEND-friendly environments guide for Tier 1 design. See the Graduated Approach (Assess, Plan, Do, Review) and the SEND guide for details.

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Common MTSS Mistakes

Schools avoid issues by proactively addressing common MTSS pitfalls (name, date). Researchers found errors in MTSS implementation. Spotting these errors early saves time and reduces learner frustration.

Using MTSS to postpone special education evaluation is a grave error and against IDEA. Schools can't force learners through all MTSS tiers before evaluation. If parents request assessment, schools must act within legal timelines. MTSS data aids evaluation (Burns et al., 2021; Jimerson, 2015; Batsche et al., 2005), but isn't required.

Check Tier 2 intervention delivery. Inconsistent delivery negates Tier 2 status. Before judging learner response, verify intervention integrity. Use checklists, observation, and logs (Gresham et al., 1993; Sanetti & Kratochwill, 2009).

Avoid skipping universal screening. Jenkins et al. (2007) found screening finds at-risk learners better than teachers do. Quiet learners may struggle without notice. Screening identifies learners with hidden planning issues.

Not graphing progress monitoring data. A number on a spreadsheet is not the same as a graph with an aimline. When data points are plotted visually, trends become obvious. A teacher can see at a glance whether the student's trajectory is pointing toward or away from the goal. Without graphs, teams make decisions based on impressions rather than patterns.

Pulling students from core instruction for intervention. Tier 2 and Tier 3 interventions are supplemental. They happen in addition to Tier 1 core instruction, not instead of it. A student who misses 30 minutes of science every day to attend a reading group is not receiving Tier 1 instruction in science. Schools need to build intervention time into the schedule, often through a dedicated intervention block, so students do not lose access to core content.

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Frequently Asked Questions

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Getting Started: A Practical Checklist

If your school is beginning to implement MTSS or you want to strengthen your role within an existing system, these steps provide a practical starting point.

Next time your MTSS team meets, bring one student's progress monitoring graph with the aimline drawn. Compare the student's actual rate of improvement to the expected rate. That single comparison will tell you more about whether the intervention is working than any narrative summary.

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Try the MTSS Tier Placement Tool

Use this free tool to evaluate data for a student and receive a recommended MTSS tier with action steps. All data stays in your browser.

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