PENG LI thinks this is interesting: Goal-directed interactions reflect user mental models. From CH 1: A Design Process for Digital Products from About Face: The Essentials of Interaction Design, 4th Edition by Christopher Noessel, Alan Cooper, Robert Reimann, David Cronin Publisher: John Wiley & Sons Released: September 2014 Note metal models. e.g. it is great success design that zoom in/out photo thru 2 figures. Share this highlight http://www.safaribooksonline.com/a/about-face-the/2765100/ Twitter Facebook Google Plus Email Get Instant Access Now Start a Free Trial Have an account? Sign in. Minimise Unlock the rest of this book and 30,000 other books and videos By clicking this box, you confirm that you have read and agree to the terms and conditions of our Membership Agreement, and you understand that when your trial period ends, you will be required to provide billing information if you wish to continue using the service. Unlock the rest of this book Start a Free 10-Day Trial loading Learn about Safari for Business Have an account? Sign in.