{Making mathematical content accessible using Tagged \PDF\ and \LaTeX} {Ross Moore} {`Tagged \PDF' (more specifically \acro{PDF/UA}) is the method developed by Adobe to allow the Web Content Accessibility Guidelines (\acro{WCAG}~1.0 and \acro{WCAG}~2.0) to be satisfied within \PDF\ documents. In this talk I will show the latest developments on using an extended version of pdf\TeX\ to allow Tagged \PDF\ documents to be produced, satisfying both \acro{PDF/A} (archivability) and \acro{PDF/UA} (Universal Accessibility). I'll show examples which include quite complicated mathematical expressions, fully tagged with \MathML, which can be `Read Aloud' in Adobe's Acrobat and free Reader software. These will include `real-world' documents containing such features as top-matter, nested list environments, logos, watermarks and other pagination artifacts, tabular material within mathematics, and some support of colour and text-styling. A special math-indexing feature has been developed, which allows the result of processing by external programs to be identified and reused in successive \LaTeX\ runs. This indexing feature leads to significant time savings when developing a full document over many processing runs. }