What is the difference between RTI and MTSS?

RTI (Response to Intervention) is a specific framework focused on academic intervention using data-based decision making. MTSS (Multi-Tiered System of Supports) is a broader framework that includes both academic (RTI) and social-emotional-behavioural supports within the same tiered structure. Most states now use MTSS terminology.

How often is progress monitored in each RTI tier?

Tier 1: universal screening 3x/year. Tier 2: progress monitoring every 2 weeks using CBM probes. Tier 3: progress monitoring weekly or bi-weekly. Lack of adequate progress (slope < expected growth, gap not closing) at Tier 2 after 6–8 weeks triggers Tier 3 consideration or special education evaluation.

RTI/MTSS Tier Placement Criteria Calculator

Formula Definitions

The RTI/MTSS Tier Placement Criteria Calculator works by applying a well-defined formula to the values you enter. Understanding the formula behind the calculation helps you interpret the result and check that your inputs are correct. Below we break down the key components that drive the RTI Tier Calculator.

The core formula used by this calculator is:

Result = f(inputs, settings)

Each variable in the formula has a specific meaning:

inputs — Values entered into the RTI Tier Calculator.
settings — Options, units, or parameters that adjust how the calculation is performed.
Result — Computed output for the chosen inputs and settings.

How to Use This Calculator

Enter the required values. Enter the required values into the RTI/MTSS Tier Placement Criteria Calculator input fields.
Adjust settings. Adjust any settings, select applicable options, or choose units as needed.
Calculate the result. Press Calculate to compute the result using the underlying formula.
Interpret the output. Review and interpret your result using the provided context, reference ranges, or explanatory notes.

Glossary and Definitions

Input: A value entered into the calculator to be processed.
Output: The computed result returned by the calculator for the given inputs.
Setting: An option that adjusts how the calculation is performed, such as unit selection or mode.
RTI tier: A key concept referenced by the RTI Tier Calculator: Calculate RTI/MTSS tier placement for reading and mathematics based on benchmark assessment performance relative to grade-level norms. Tier 1: at or above benchmark; Tier 2: between 10th and 25th percentile; Tier 3: below 10th percentile.
MTSS: A key concept referenced by the RTI Tier Calculator: Calculate RTI/MTSS tier placement for reading and mathematics based on benchmark assessment performance relative to grade-level norms. Tier 1: at or above benchmark; Tier 2: between 10th and 25th percentile; Tier 3: below 10th percentile.
Benchmark assessment: A key concept referenced by the RTI Tier Calculator: Calculate RTI/MTSS tier placement for reading and mathematics based on benchmark assessment performance relative to grade-level norms. Tier 1: at or above benchmark; Tier 2: between 10th and 25th percentile; Tier 3: below 10th percentile.
Reading tier: A key concept referenced by the RTI Tier Calculator: Calculate RTI/MTSS tier placement for reading and mathematics based on benchmark assessment performance relative to grade-level norms. Tier 1: at or above benchmark; Tier 2: between 10th and 25th percentile; Tier 3: below 10th percentile.
Math tier: A key concept referenced by the RTI Tier Calculator: Calculate RTI/MTSS tier placement for reading and mathematics based on benchmark assessment performance relative to grade-level norms. Tier 1: at or above benchmark; Tier 2: between 10th and 25th percentile; Tier 3: below 10th percentile.
Intervention placement: A key concept referenced by the RTI Tier Calculator: Calculate RTI/MTSS tier placement for reading and mathematics based on benchmark assessment performance relative to grade-level norms. Tier 1: at or above benchmark; Tier 2: between 10th and 25th percentile; Tier 3: below 10th percentile.