Wikis (also WikiWikis or WikiWebs) are open content management systems for the creation and maintenance of content which is available over the Internet or Intranet in the form of a web page collection. Users are not only able to read the pages but can also edit them and create new content. Thus users are able to constantly edit articles and take part in the process of setting up a page. The content and keywords of articles refer to other content on the page. Wikis a offer high usability, an easy way of designing articles and openness. The best-known Wiki is the free online encyclopedia Wikipedia (www.wikipedia.de).