Features that allow end users to make changes, adapt or tailor theirsoftware applications have become increasingly common in the lastdecade. Especially developers of generic, mass produced applicationsseem to cram in tailoring features to make the systems flexible enoughfor a wide variety of users. In this thesis, the use of thesetailoring features is studied in detail in an experiment includingeight end users. The results of the experiment are discussed to showwhat aspects of the tailoring features are constraining orfacilitating to the different end users, and tell us that not allfeatures are accessible to all end users, because they vary incomplexity and difficulty. The process of tailoring is described usingconcepts from the field of educational research.