Marc Hassenzahl explains the fascinating concept of User Experience and Experience Design. Commentaries by Don Norman, Eric Reiss, Mark Blythe, and Whitney Hess
User Experience and Experience Design !
Renaud, Karen and Just, Mike (2010): Pictures or questions?: examining user responses to association-based authentication. In: Proceedings of the HCI10 Conference on People and Computers XXIV 2010. pp. 98-107. Available online
Just, Mike and Aspinall, David (2009): Personal choice and challenge questions: a security and usability assessment. In: Proceedings of the 2009 Symposium on Usable Privacy and Security 2009. p. 8. Available online