The ability to categorize concepts is an essential capability for human thinking and action. This is why both psychology and subject-specific educational research deal with this topic. For computer science education, there have been no corresponding studies available so far. This paper reports on an empirical study in which around 500 German students from primary to higher education were presented with 23 IT-related terms (such as computer, Facebook, hard drive, virus) with a request to assign these to self-defined categories and to give the categories individual names. This paper gives a first insight into the categorization behavior.