Multi-Tiered Systems of Support — definition, tiered logic, origins and evidence base.
Multi-Tiered Systems of Support (MTSS) is an evidence-based, tiered framework that schools use to support every student systematically. It emerged in the United States from two earlier traditions — Response to Intervention (RTI; academic) and Positive Behavioral Interventions and Supports (PBIS; behavioural) — and integrates them into a single school-wide system.
An MTSS combines four core elements:
MTSS is therefore not a programme or a single method. It is an organisational and conceptual framework into which specific programmes and methods are placed.
Students need different amounts and intensities of support. MTSS organises support proactively and in tiers — rather than waiting until difficulties have become entrenched.
Tier 1 (universal prevention) is the foundation. High-quality, evidence-based instruction and effective classroom management are designed so that the majority of students — typically around 80 % — are supported sufficiently at this level alone.
Tier 2 (targeted prevention) supplements Tier 1 for students whose screening or progress data indicate additional need. They typically receive short, focused small-group interventions with clear effectiveness criteria.
Tier 3 (intensive prevention) is for students with persistent and complex needs. Support is intensive, individually tailored and based on in-depth diagnostics such as a functional behaviour assessment.
The tiers are permeable: students move between them on the basis of data. A tier assignment is always temporary and reversible — a child does not "belong" to Tier 2 or Tier 3, but receives the corresponding support for the period in which the data indicate it is needed. → Detailed description of the three tiers
MTSS has its roots in U.S. school research and has been continuously developed since the 1960s. Its foundational concepts are:
RTI emerged in academic support — particularly early reading — as an alternative to the so-called wait-to-fail model. Instead of identifying learning difficulties only once they have become clearly visible, children are to be detected early and supported with progressively more intensive interventions.
PBIS developed in parallel in the behavioural domain, driven primarily by the Center on PBIS around George Sugai and Robert Horner at the University of Oregon. PBIS applies the logic of tiered prevention to school behaviour.
MTSS brings these two traditions together into a single integrated system that addresses academic and behavioural support — and, in more recent conceptualisations, social-emotional learning — within the same framework.
The three terms are often used interchangeably in research and practice. Briefly distinguished:
RTI
narrower in scope; primarily focused on academic support (especially reading and mathematics).
PBIS
narrower in scope; primarily focused on behavioural support.
MTSS
the umbrella term. A complete MTSS covers both academic and behavioural support within the same school-wide system.
In the United States, MTSS is increasingly treated as the contemporary term; RTI and PBIS are understood as predecessors and component frameworks that fit inside an MTSS.
In Germany and the wider German-speaking region, MTSS is not yet a system implemented at scale. Research and pilot projects are, however, increasingly adapting the framework to the German school context — particularly in behaviour-related support in primary schools.
One example is Multimo, a tiered support approach for primary schools developed at the University of Cologne. Multimo combines the Good Behavior Game as a universal intervention (Tier 1), Daily Behavior Report Cards as a targeted intervention (Tier 2) and individual case coaching based on the SCEP approach (Tier 3). The effectiveness of these components has been examined in several empirical studies.
The multimo5–7 project develops and implements an MTSS for early identification and support of children at risk for learning or behavioural difficulties. It aims to systematically support school readiness and academic as well as social-emotional development during the transition from preschool to the end of first grade — by closely connecting school-based and family-based support structures. The pedagogical interventions are grounded in two needs assessments that systematically capture each school's challenges and requirements.
The project is carried out at four primary schools in the Mettmann district and is accompanied by scientific evaluation. It examines, in particular, the effectiveness of diagnostically informed interventions in everyday school practice (Tiers 1–3) as well as preparatory parent–child sessions before school entry. Alongside child-level support, parental competencies and school-level conditions are also taken into account. The research addresses both the impact of the interventions and questions of feasibility and acceptance among participants.
A particular focus lies on implementing MTSS under real-world conditions and on examining evidence-based support measures in everyday school practice.
mtss.info will cover these and further implementation examples in more detail as the site grows.
The effectiveness of MTSS and its component frameworks has been studied extensively in international research. Key findings:
Effectiveness depends decisively on how well an MTSS is actually put into practice. Implementation fidelity — the degree to which a system is delivered as intended — is a central concept in MTSS research. → Go to research
