The Lab Rubric specifies that the assignment documents are properly formatted for maximum compatibility with screen reader software.
This standard applies to learning resources in general. An excellent collection of resources on making learning resources accessible is available on PCC's Instructional Support Resources on Accessibility for Online Course Content. Rather than repeating all of that information here, some of the important themes include:
As mentioned above, for more information on creating accessible web pages, Word documents, Powerpoint presentations, PDFs, and other learning resources, please visit PCC's Instructional Support Resources on Accessibility for Online Course Content. It is also worth noting that Karen Sorensen, PCC's Accessibility Advocate, offers frequent online training sessions on document accessibility. For example, here is a recording of one of Karen's sessions on making Microsoft Word 2010 documents accessible.
You might also find these videos helpful. They were developed for use in the Online Instructor Orientation in Spring, 2014. In the first video, we look at some resources for creating accessible documents, and talk about some general guidelines:
Here, we create an accessible document based on the Lecture template in Desire2Learn, using the HTML templates provided as part of all development shells (if you don't already have a copy, contact firstname.lastname@example.org and ask for a copy of the standard course development shell.