Neither Norman or Nielssen are appropriate as compasses, but their
work is important. I use Norman's "Form, Function and Fit" to talk
with clients all the time. It is a bit simplistic, but helps them to
understand why we as designers need the research up front looking for
opportunities and patterns, and the testing throughout the design
process to validate our ideas. Nielssen represents the radical and
stark end of interface, but not a very realistic application.
