Table 6.

Descriptions and examples of usability issues related to Satisfaction.

Usability Issue	Definition	Example/Application
Desired answer option not available	Response options did not reflect the desired response options of the user	Occurred most frequently when answering whether the amount of food eaten was “usual”, “much more than usual”, or “much less than usual”. Many participants felt that “more than usual” or “less than usual” would have provided a more accurate picture of the quantity eaten.
Desired system feature not available	System features do not allow users to report intake accurately in a convenient way	Many participants wanted an easier way to accurately represent their diet than what was offered by the system. For example, many wanted to report water consumed intermittently throughout the day as opposed to entering each instance of water consumption individually.