This instructional guide from Understood, explains how educators can apply the Universal Design for Learning (UDL) framework to lesson planning. The guide focuses on designing inclusive classrooms that anticipate the diverse needs of learners, including students with learning and thinking differences, rather than adapting instruction for individual students after barriers arise. It outlines a three-stage process: (1) proactively designing lessons by analyzing goals, anticipating student variability, and incorporating flexible options to reduce barriers; (2) implementing lessons through facilitation, observation, and process-based feedback; and (3) reflecting on and redesigning instruction based on student input and formative assessment. The guide emphasizes shifting attention from perceived limitations of individual students to the design of curricular goals, assessments, methods, and materials, with options such as choice boards, text-to-speech, graphic organizers, and assistive technology providing multiple pathways for students to engage and demonstrate learning. The guide offers a practical resource for introducing UDL and helping educators incorporate accessibility and learner variability into instructional planning.