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Data Guide · MTSS

MTSS and Interventions

MTSS is not a label for students. It's a promise about how fast help arrives. The data inside it has exactly two jobs: match the support to the need, and check that the support is working. Hold onto those two jobs and every chart on this page reads easily.

Updated July 2026

See it in one chart

The tier triangle is the most famous image in MTSS, and it's easy to read as a map of students. Here it is doing its one real job: showing whether the core is carrying its share.

The tier triangle, read rightPart-to-whole · system health check
Tier 1 · about 80% strong core instruction and support for everyone Tier 2 · about 15% targeted small-group help Tier 3 · about 5% intensive, individualized If Tier 2 and 3 hold 40% of your students, the triangle isn't wrong. Your Tier 1 needs help. share of all students served at each level of support
Illustrative data, not a real school.
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Why this chart wins: a part-to-whole picture with a built-in hierarchy of intensity is the one legitimate job of the pyramid. It answers a single question at a glance: is the core carrying its share? The commonly misused alternative isn't another chart, it's this same triangle read as a filing cabinet for students. Read the bands as levels of support rather than places students live, and the triangle stays what it was built to be: a health check on the core. The percentages describe the system, not the students.

Progress monitoring: six weeks against the aimlineTime series · decision rules
aimline to the goal actual trend 4 in a row below the line: change something Wk 1 Wk 2 Wk 3 Wk 4 Wk 5 Wk 6 score

Move your pointer across the chart to read any point.

Illustrative data, not a real school.
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Why this chart wins: intervention decisions need a time series against an aimline, because the decision rules live in the pattern: how many consecutive points sit below the line. The misused alternative is a before-and-after pair of bars, which collapses six weeks of story into two numbers and loses the exact trend the decision rules depend on.

The big picture

Ask ten educators what MTSS is and you'll usually hear the same shorthand: it's where we put the students who need help. That answer is understandable, and it undersells the idea. MTSS is a promise about speed. When a student starts to slip in reading, in behavior, or in attendance, how fast does help show up? How well does it fit? And how quickly do we notice if it isn't working? That's the whole framework in three questions.

Before systems like this existed, schools ran on what researchers called the wait-to-fail model. A student had to fall far enough behind that an adult finally noticed, and by then the gap was years wide. MTSS flips that. Everybody gets screened. Nobody has to fail to get help. The data exists so support arrives in weeks, not semesters.

That's why the numbers on this page matter more than most. Screening data finds students early. Progress monitoring data tells you whether the plan is working while there's still time to change it. Read them right, and MTSS is the fastest safety net a school owns.

The takeaway: the tiers describe the help, never the student. Students move between tiers as the data changes, and that movement isn't churn or failure. It's the system doing exactly what it was built to do.

The vocabulary

Nine terms cover almost every MTSS meeting you'll ever sit in. Each one comes with the sentence you'll hear it in.

Tap any card to flip it over

How these data look in practice

Here's how to put MTSS data in front of people so the system stays visible and the students stay people, drawn with illustrative numbers you can swap for your own.

100% COLUMN VS 80/15/5

Check your triangle against 80/15/5

Tier 1 is 4 points shy of 80. A core instruction signal. Tier 3 Tier 2 Tier 1 6% 18% 76% 5% 15% 80% This building · 271 students Healthy reference

Use it when: the team asks whether the system is healthy. Why it works: the reference column sits right beside yours, so a thin Tier 1 reads as a core instruction question instead of a student problem.

LINE + AIMLINE

Plot the promise, then check it weekly

words correct per minute 42 60 aimline: 60 by week 8 trend 4 in a row below the aimline: change the plan, not the goal Wk 1 2 3 4 5 6 7 8

Use it when: any intervention is running. Why it works: the aimline makes the goal visible, the trendline makes the pace visible, and the four-point rule turns the gap into a decision instead of a debate.

MOVEMENT SLOPE

Follow the movement, not the snapshot

More than half exited. Movement is the system working. Tier 2 in fall 24 students 13 exited to Tier 1 support did its job 8 stayed in Tier 2 plan continues 3 moved to Tier 3 more help, found fast FALL SPRING

Use it when: someone asks whether interventions are working over a semester. Why it works: exits and intensifications are the outcome data, and one glance shows students flowing through support instead of parking in it.

COUNT TABLE

Count where the support will land

GRADE TIER 1 TIER 2 TIER 3 TOTAL Grade 3 74 13 5 92 Grade 4 61 22 7 90 Grade 5 71 14 4 89 All grades 206 49 16 271 share 76% 18% 6% 100% Grade 4 holds 22 of the 49 Tier 2 students. Schedule there.

Use it when: it's time to schedule groups and staff them. Why it works: percentages size the system, but counts size the caseload, and the highlighted cell is Monday's master-schedule question.

Watch the same data change forms

One dataset, three charts. Feeling the difference is the fastest way to pick the right one.

A gentler fit: the tier triangle used as a filing cabinet, with student names parked in its bands. The triangle's one real job is the system check in the first card. When the conversation turns to specific students, the count table above holds people and places help, no labels required.

Three lenses

Same data, three different jobs. Here's what MTSS data should mean depending on where you sit.

District leaders and data teams

District office

Your job is the system behind the systems: is screening reaching everyone, and does flagged mean helped?

  • What share of flagged students started an intervention within two weeks?
  • Does Tier 1 serve about 80% in every building, or only in the district average?
  • What does tier movement look like over the year? Are students exiting support, or parked in it?
  • Which schools have screening coverage gaps, and why?
Principals, counselors, teachers

School building

You own the speed of the promise. The cadence of your data meetings is the speed limit on help.

  • How often does the data team meet, and does every flagged student get discussed?
  • Who is waiting for support right now, and how long have they waited?
  • Before we intensify, did we check fidelity on what we already tried?
  • Are our decision rules written down and used the same way in every meeting?
Families

Kitchen table

If your student gets an intervention, that's the school noticing early and acting. It's extra help, not a punishment and not a label.

  • What's the goal line, and when will we look at the progress data together?
  • What exactly does the extra help look like, and how often does it happen?
  • What can we do at home that lines up with it?
  • If it isn't working after a few weeks, what changes?

Sources and further reading

The National Center on Intensive Intervention publishes tool charts rating screening and progress monitoring measures, plus intervention evidence reviews. The MTSS Center at the American Institutes for Research covers implementation across all three domains. For the behavior side, PBIS.org is the official technical assistance center, with free fidelity tools and data guides.