UDL - Curriculum Barriers & Missed Opportunities

To bring your understanding of UDL full circle it is imperative you complete an assessment of Curriculum Barriers. The tutorial is comprehensive and gives you framework for completing your own assessment. I found mine to be less extensive in terms of written explanation, in spite of this it gave me a window into existing and potential curriculum barriers.
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Snapshot of my assessment:

Allow at least 45 minutes for your first attempt - again, I am hoping the learning curve is short. I discovered I rely heavily on the use of visual presentation: Smartboard, whiteboard, overhead, and flip chart paper. I often use the method of a teacher "think aloud" to teach; and use of technology at the student level is driven by time and resource constraints. If I had a student with a vision disability or hearing disability they would face immediate barriers. I currently have minimal options for a student with any needs for assistance with a written response, and my assessments, sadly, are largely written.

I do use small group centers, but wonder, now if I have set some of my students up for failure by providing a lack of alternative access to center material. My centers have been driven more by classroom/student/material management then by student access.

To address the UDL framework for student centers, I searched the web .... the resources for centers are endless, the UDL component, however, is lacking. I need to review my existing materials through the UDL lens.