In the earliest stages of course design and throughout the process considerations for how to design your course for universal access should be made. The more proactive you are the better the results and the fewer issues that you will address later when students find themselves unable to participate in course activities. Also, in final checkpoints before the course launches, double check for accessibility-related issues. Some common areas to look at include: videos (captions), images (alternate text), documents and presentation (correct formatting and structure), assessments (platforms and types). You may find it helpful to "step into the shoes of your students" and consider the course from a variety of perspectives. Try the UDL and Accessibility Perspectives page for help.