Sissi Closs, professor of Information and Media technology at the Karlsruhe University of Applied Sciences, CEO of C-Topic Consulting and Supervisory Board Chairman of FCT AG, is one of the leading German experts in the field of technical communication. She is an internationally well-known lecturer and consultant for content management and information architecture. Sissi Closs has defined the class concept method for developing flexible frameworks for Topic and Link classes®. As a specialist for topic-based structuring, she belongs to the DITA pioneers and has designed and implemented the first DITA implementation in Germany. She is also the author of a number of books about single source publishing, topic-based structuring, and mobile documentation.