UDL is based upon the most widely replicated finding in educational research: learners are highly variable. In virtually every report of research on instruction or intervention, individual differences are not only evident in the findings; they are prominent. When considered through the UDL lens, these findings are fundamental to understanding and designing effective learning environments and experiences. The research that supports UDL falls into three categories: foundational research of UDL, research on the UDL principles, and research used to develop the UDL guidelines.
Foundational Research on UDL
UDL draws from a variety of research including the fields of neuroscience, the learning sciences, and cognitive psychology. It is deeply rooted in concepts such as the Zone of Proximal Development, scaffolding, mentorship, and modeling, as well as the foundational works of Piaget; Vygotsky; Bruner, Ross, and Wood; and Bloom, who espoused similar principles for understanding individual differences and the pedagogies to best support them. The foundational research was recently expanded to draw from literature in disability studies, inclusive education, and asset-based pedagogies. The expansion is grounded in concepts such as disability as a dimension of identity (Baglieri, et al., 2011; Connor, 2008), funds of knowledge (González, et al., 2006), culturally relevant pedagogy (Ladson-Billings, 1995), and culturally sustaining pedagogies (Paris & Alim, 2014).
Research on the Three Principles of UDL
The research basis for the general principles of UDL is grounded in modern neuroscience. The three basic principles are built upon the knowledge that our learning brains are composed of three different networks: affective, recognition, and strategic. The UDL Guidelines align these three networks with the three principles: affective to engagement, recognition to representation, and strategic to action and expression. Neuroscience provides a solid foundation for understanding how the learning brain intersects with effective instruction.
Multiple Means of Representation & Teacher Clarity:
MIM's emphasis on planning, instruction, and assessment that accommodates diverse learners aligns with Hattie's finding on "Teacher Clarity" (effect size = 0.84). When teachers are clear in their communication and instructional planning, it enhances understanding, which is also a goal of UDL’s principle of providing diverse ways for students to access and understand information.
Multiple Means of Action & Expression & Feedback:
MIM's focus on diverse assessment methods, allowing students to express their understanding in different ways, connects to Hattie's research on "Feedback" (effect size = 0.70). Quality feedback, which aligns with MIM and UDL principles, is critical in helping students understand how to improve and succeed. Allowing students to demonstrate learning in multiple formats ensures they receive feedback that is tailored to their specific needs and strengths.
Multiple Means of Engagement & Engagement Strategies:
MIM’s emphasis on connecting new learning to real-life contexts and creating a supportive learning environment directly connects to Hattie's findings on the importance of "Student Engagement" (effect size = 0.48) and "Teacher-Student Relationships" (effect size = 0.52). UDL’s principle of engaging students by linking learning to their interests, experiences, and emotions is reinforced by these findings, suggesting that engagement and relationship-building are critical for student achievement.
Teacher Professionalism & Collective Teacher Efficacy:
MIM’s focus on continuous professional growth, collaboration, and cultural competence aligns with Hattie’s concept of "Collective Teacher Efficacy" (effect size = 1.57), which is one of the highest-rated influences on student achievement. The commitment to professional development and reflective practice, as seen in MIM and UDL, helps build a more effective and inclusive teaching community, leading to better outcomes for all students.