About the authors Anja Ebersbach is an information scientist. She is a university and technical college instructor, and is also active as a freelance IT trainer. She is working on her dissertation on the topic of "Wikis as Tools of Scientific Work." Markus Glaser, also an information scientist, primarily works as a web and application programmer, where he specializes in MediaWiki and TWiki systems. Dr. Richard Heigl, a historian, works as a freelance instructor, IT trainer and moderator of large group seminars. He is primarily occupied with the planning and moderation of wiki projects. Alexander Warta, information scientist, is a doctoral candidate employed at Robert Bosch GmbH in Stuttgart. He is a specialist for the wiki software Confluence. Wiki - Web Collaboration Wikis are Web-based applications that allow all users not only to view pages but also to change them. The success of the Internet encyclopedia Wikipedia has drawn increasing attention from private users, small organizations and enterprises to the various possible uses of wikis. Their simple structure and straightforward operation make them a serious alternative to expensive content management systems and also provide a basis for many applications in the area of collaborative work. We show the practical use of wikis in carrying out projects for users as well as for maintainers. This includes a step-by-step introduction to wiki philosophy, social effects and functions, a survey of their controls and components, and the installation and configuration of the wiki clones MediaWiki, TWiki and Confluence. In order to exemplify the possibilities of the software, we use it as a project tool for planning a conference. Features and Benefits Introduces three of the most popular wiki engines Explores the wealth of possibilities with task oriented examples Provides an overview of social and philosophical issues Includes a CD containing all relevant open source software.