The goal of the Addressing Accessibility in Mathematics Project is to develop professional development models and materials that  enable mathematics and special education teachers to make middle school mathematics more accessible to a wide range of students, including those with special needs.  Three  papers may be downloaded: (a) Accessibility Strategies to Consider; (b) Guiding Questions for Accessibility Strategies; and (c) the Accessibility Tool List.  Free sign-in.  (Addressing Accessibility in Mathematics is a project of the Education Development Center Inc, Newton, Massachusetts, with funding from the National Science Foundation.)