Tim Comber, John R. Maltby. User operations as language elements: measuring usability and user competence through redundancy. In Elizabeth A. Kemp, Chris Phillips, B. L. William Wong, editors, Proceedings of the 4th Annual Conference of the ACM Special Interest Group on Computer-Human Interaction, CHINZ 2003, Dunedin, New Zealand, 3-4 July 2003. pages 57-62, ACM, 2003. [doi]
Abstract is missing.