Figure 47.1: The Usability Engineering Life Cycle.(Illustration taken from Mayhew,1999.)                     

Deborah J. Mayhew (2003). Requirements Specifications Within The Usability Engineering Life Cycle In: J. A. Jacko and A. Sears (Eds) The Human-Computer Interaction Handbook. © 2003 by Lawrence Erlbaum Associates.  All Rights Reserved.