To obtain rapid feedback on the usability of prototypes..
- Potential usability problems can be detected at an early stage
before development is complete.
A simplified version of usability testing
is used. Only 3-5 users are required, and it is usually best to
prompt the user to explain their interpretation of the contents
of each screen and their reason for making choices. However, if
estimates of usability measures are required, ask the user to think
aloud, but do not interrupt them.
- Produce a list of usability problems, categorised by importance
(use post-it-notes to sort the problems), and an overview of the
types of problems encountered.
- Arrange a meeting with the project manager and developer to
discuss whether and how each problem can be fixed.
If the necessary skills are available, the design can be evaluated
and improved by expert evaluation.
This can complement prototyping, or use methods which replace users
by usability experts if it is impossible to gain access to users.
Once a complete system is available, use usability
testing to ensure that all requirements have been met.