A SUMI test was performed at an early stage within the system test. Hereafter you find the results
of the SUMI test.

Based on these results, what would you recommend as the most appropriate approach for
usability testing?

A.
Since the SUMI scores are largely above market average no further action on usability is
needed

B.
Since the standard deviation of most SUMI scales is much too large, a new SUMI test must be
performed

C.
Since the scores are not really showing a high level of user-satisfaction additional usability
testing based on use case is needed

D.
Since the SUMI results do not provide details, an additional focused heuristic evaluation on the
lower scales is recommended

Explanation: