In a usability evaluation it’s good practice to measure both how users perform on realistic tasks and what they think about the usability of the interface. But what exactly DO you ask the users? “Is this usable?” … “Is the interface easy to use?” … “Did you like using the app?” While you can cobble
There isn’t a usability thermometer to tell us how usable an interface is. We observe the effects and indicators of bad interactions then improve the design. There isn’t a single silver bullet technique or tool which will uncover all problems. Instead, practitioners are encouraged to use multiple techniques and triangulate to arrive at a more
There is a long tradition of including items in questionnaires that are phrased both positively and negatively. This website was easy to use. It was difficult to find what I needed on this website. The major reason for alternating item wording is to minimize extreme response bias and acquiescent bias. However, some recent research[pdf] Jim
