When you plan a lesson with the UDL framework in mind, you think about the barriers that are going to keep your students from being successful. This chart will give suggestions to help your students tackle a variety of academic tasks. Challenges might include students who can't decode on grade level, have difficulty with organization, and students who struggle with spelling.
I think one thing to remember is that offering a choice of tools to all students in your class will be beneficial. All students will begin to learn what works best for them and begin to make choices based on what they know about themselves as learners. If you watch the video clip of Erin Swift, she talks a little bit about the metacognition that develops as she offers choices for learning.