In a content analysis a category systems is often required. One can develop an own one which is a lot of work, or one can use already existing category systems.

This section describes already existing category systems, the name and the number of categories and the number of search patterns. There is also information which category systems are available in several languages and what software they require.

One can use these category systems as a basis for one's own research. It is possible to edit a category systems and adapt it.