Difficulties in Modeling GNU/Linux User Behaviors
http://www.usabilityprofessionals.org/upa_publications/upa_voice/volumes/2004/April/linux.html

Queen, Matt
Usability Professionals Association
2004

Abstract:

Creating models of user behavior has been helpful in predicting basic outcomes of computer usability testing involving human subjects. However, models and methods have been based on a narrow view of computer use; namely, they are not compatible with behaviors resulting from using the Linux operating system. How different could Linux be from other operating systems?! This article provides a few points of comparison.