Universal Design for Learning (UDL): The CAST Framework Explained

Universal Design for Learning (UDL) is an educational framework developed by CAST (formerly the Center for Applied Special Technology) that applies universal design thinking to teaching and curriculum design. Rather than creating a single rigid lesson plan and then accommodating students who struggle, UDL builds flexibility into the learning experience from the start.

The Three Principles of UDL

UDL is organized around three principles, each grounded in neuroscience research on how people learn:

1. Multiple Means of Engagement (the “Why” of learning)

Students differ in what motivates them and sustains their interest. Some are engaged by novelty and spontaneity; others prefer routine and predictability. Some thrive on competition; others prefer collaboration.

UDL addresses this by offering choices in how students engage with content: self-directed projects alongside structured assignments, individual work alongside group activities, topics that connect to students’ interests alongside required material.

2. Multiple Means of Representation (the “What” of learning)

Students differ in how they perceive and comprehend information. Some learn best from text, others from visual diagrams, others from hands-on manipulation, and others from spoken explanation.

UDL addresses this by presenting content in multiple formats: text with illustrations, videos with captions, interactive simulations, physical manipulatives, and audio recordings. Key vocabulary is defined, background knowledge is activated, and patterns and relationships are made explicit.

3. Multiple Means of Action and Expression (the “How” of learning)

Students differ in how they navigate a learning environment and express what they know. Some write fluently; others communicate better through speech, drawings, or physical demonstration.

UDL addresses this by allowing varied forms of assessment and expression: written essays alongside oral presentations, physical models, digital portfolios, or multimedia projects. Students are supported with tools (spell-checkers, speech-to-text, graphic organizers) and scaffolded practice.

UDL and the Original 7 Principles

UDL extends rather than replaces the seven principles of universal design. Where the original principles address product and environmental design, UDL applies the same philosophy to the learning experience itself.

The parallels are direct: multiple means of representation connects to perceptible information (Principle 4). Multiple means of action and expression connects to flexibility in use (Principle 2). Multiple means of engagement connects to equitable use (Principle 1), ensuring that motivation and access are not gatekept by a single modality.

The UDL Guidelines

CAST’s UDL Guidelines (version 2.2, updated 2018) provide a detailed framework with checkpoints organized under each principle. The guidelines are freely available at cast.org and are used by educators, curriculum developers, and educational technology designers worldwide.

Each principle breaks down into access, build, and internalize levels:

• Access: Reduce barriers to initial engagement with the material.
• Build: Support sustained effort and developing understanding.
• Internalize: Help students become self-directed, strategic learners.

Evidence Base

Research supporting UDL has grown substantially. A 2016 meta-analysis published in the Review of Educational Research found that UDL-based interventions positively affected learning outcomes across diverse student populations. The U.S. Higher Education Opportunity Act of 2008 includes UDL in its definition of effective instructional approaches.

Studies from the National Center on Universal Design for Learning have demonstrated improved outcomes in reading comprehension, mathematical reasoning, and science understanding when UDL principles are applied. Importantly, gains are not limited to students with disabilities — all students tend to benefit from increased flexibility and multiple representation modes.

UDL in Practice

K-12 education: Many U.S. school districts have adopted UDL as a framework for curriculum design. The Every Student Succeeds Act (ESSA) of 2015 references UDL as an evidence-based approach. Teachers might offer a choice board with multiple ways to demonstrate mastery, provide text alongside video and audio versions of the same content, and allow students to set personal learning goals.

Higher education: Universities including Harvard, Boston College (where CAST is located), and the University of Vermont have integrated UDL into course design guidance. Online learning platforms like Canvas and Blackboard incorporate UDL-aligned features such as alternative format assignments and built-in accessibility tools.

Corporate training: Organizations are applying UDL to professional development and compliance training, offering multi-modal content delivery and flexible assessment methods.

Educational technology: Platforms like Bookshare (providing accessible digital books), Learning Ally (audio textbooks), and various assistive technology tools align with UDL principles by offering multiple representation and expression modes.

Common Misconceptions

“UDL means every lesson must include every modality.” UDL does not require exhaustive multi-modal presentation of every concept. It requires thoughtful flexibility — identifying barriers and providing options where they matter most.

“UDL is just good teaching.” While UDL shares features with effective pedagogy, it is a structured framework with specific guidelines, checkpoints, and an explicit foundation in neuroscience. Calling it “just good teaching” risks undervaluing its systematic approach.

“UDL is only for students with disabilities.” UDL is designed for learner variability as a whole. Students who are gifted, students learning in a second language, students experiencing stress or trauma, and students with disabilities all encounter barriers that UDL addresses.

Getting Started with UDL

For educators new to UDL, CAST offers free online resources including the UDL Guidelines, planning tools, and examples. The free accessibility courses online article in our Resources section includes UDL-focused learning opportunities. For a broader entry point, see our beginner’s guide to universal design.

Key Takeaways

• UDL is a structured educational framework built on three principles: multiple means of engagement, representation, and action/expression.
• Developed by CAST and grounded in neuroscience, UDL has been adopted in U.S. federal education policy and implemented in K-12, higher education, and corporate training.
• UDL extends universal design principles to learning, benefiting all students rather than only those with identified disabilities.
• The framework is systematic, not ad hoc — CAST’s guidelines provide specific checkpoints for implementation.

Sources

• CAST — UDL Guidelines Version 2.2: https://udlguidelines.cast.org/
• CAST — About Universal Design for Learning: https://www.cast.org/impact/universal-design-for-learning-udl
• W3C WAI — Accessibility Fundamentals: https://www.w3.org/WAI/fundamentals/
• Centre for Excellence in Universal Design — Education: https://universaldesign.ie/what-is-universal-design