There were a lot more
critical problems associated with phone conversation in the MRT
environment, comparing to serious and cosmetic problems. Some
problems were specific to the environment itself, meaning that
there were no corresponding occurrences in the laboratory tests.
The major difference is that there was a generic increase in the
occurrence usability problems for the MRT usability tests and
associated issues in the severity of the usability problems found.
Usability problems also existed that were unique to the usability
testing environment.
The participants’ behaviors