A framework to improve and optimize teaching and learning for all people based on scientific insights into how humans learn (http://www.cast.org/our-work/about-udl.html#.XV25uXt7lPY CAST).

There are 3 aspects or tenants to this framework

• Engagement: Stimulate interest and motivation for learning
• Representation: Present information and content in different ways.
• Action and Expression: Differentiate the ways students can express what they know.