
Usability Engineering
that never changes. On the other hand, there are trade-offs involved
in changing user representatives, since one also does not want to
spend time explaining the project to new people, so such changes
should not be made more than a few times
during
a project.
4.6
Coordinating
the
Total Interface
Consistency
is one of the most important usability characteristics
(see
Section 5.4 on page
132).
Consistency should apply across the
different media which form the total user interface, including not
just
the application screens but also the documentation, the online
help system, and any online or videotaped tutorials [Perlman