I used these three basic guidelines to test the users of my prototype. You want order a cup of skim…

Suppose there was a physical button next to the screen to enter the order system, and the system could recognize…

Create a front-end to wikipedia that makes the site inviting, explorable and delightful for someone who does not know what…

Smartphone screen based version of the counting device:

Bad example: The tabs on this page always change when I switch from one tab to another. Some tabs just disappeared,…