Table 4.

Descriptions and examples of usability issues related to Efficiency.

Usability Issue	Definition	Example/Application
User-specific terminology missing	Users search for food items in terms familiar to them that the system did not recognize.	Occurred when entering foods in the search bar. For example, searching for “Palm Bay” instead of the system recognized “vodka cooler”.
System asks irrelevant question	User is asked questions that are not relevant based on answers they have previously given.	Occurred most frequently during “add details” tasks. For example, asking participants where they obtained the ingredients for their tap water.
Search item missing/inaccurate	Users search for food items in common language but the system returns either no results or inaccurate results.	Occurred when entering foods in the search bar. See Table 5 for a list of items not found in the system and items participants substituted when this occurred.
Next button results in lost content	Users proceed to the next task without correctly submitting the previous task. After realizing the error and reverting back, content previously entered has been lost.	Occurred most often when participants selected “finish with this meal” (similar to the function of a “next” button) before correctly adding all food items to the meal.
Submits incorrect information—known to user	Users deliberately enter incorrect information as determined via the participant’s verbalization that they were doing so.	Occurred in situations where the participant felt it was too much work to enter the information accurately, because they weren’t sure what the correct information was, or because they wanted to enter the information accurately but did not know how to do so. For example, “This is assuming I only had one burger so I am just going to say 3 patties because realistically I had 3 burgers.”
Misclick	Users click in a location that is different from where they need to click to accomplish a task.	Occurred often when the participants clicked “next”, which took them to the “add details” task when they had not finished reporting all of their meals.
Misspell	User makes a spelling mistake when searching for or entering a food item.	Occurred when entering foods in the search bar or via free text.
Filter results feature used incorrectly	User misinterprets the list of food items returned from search and/or uses it incorrectly.	Occurred when participants reviewed the list of food items returned from search. For example, the ASA24 offers functionality to filter the search results. One participant interpreted those filter options as ingredients for the food items they were entering, which resulted in confusion.