The document provides information on various lesson design frameworks including Universal Design for Learning (UDL), Understanding by Design (UbD), and Differentiated Instruction (DI). It then focuses on explaining UDL in more detail. UDL is a framework that aims to remove barriers to learning by providing multiple means of representation, expression, and engagement. The document outlines the three principles of UDL and provides resources from CAST on the approach. It also briefly describes DI and UbD, positioning them all as complementary frameworks to promote inclusive and effective lesson design.