The Department of Defense has mandated the use of a two-factor security system for access and authentication. The increased security of such a system has been extensively researched by the military. This research uses a survey to examine the effects on productivity and usability of implementing such a system.
Strouble, Dennis; Shechtman, Gregory M.; and Alsop, Alan S., "Productivity and Usability Effects of Using a Two-Factor Security System" (2009). SAIS 2009 Proceedings. 37.