Stage 3:
Design Concepts & Key Screen Prototype
–Create specific usability objectives based on
user needs
–Initiate the guidelines and style guide
–Select a navigational model and a design
metaphor
–Identify the set of key screens: login, home,
major processes
–Develop key screens using rapid prototyping
tool
–Conduct initial reviews and usability
tests
Stage 4:
Iterative Design and Refinement
–Expand key-screen prototype into full
system
–Conduct heuristic and expert reviews
–Conduct full-scale usability tests
–Deliver prototype and specification