The users interact with a prototype of the product. The designer can present the design to the user in many forms, such as a mockup, a story board, paper screens, and even the product itself. Paper Based Screen Testing Paper based testing can take place early in the design process. The designer looks for problems in the user interface. They use this opportunity to test the features of the design that concern them the most.
Paper based testing is a common form of usability testing.
In most cases, an artist or designer creates mock ups of the design. Then, they show it to a couple of prospective users. They try to catch usability problems in the designs before they use any more production resources. Many artists choose to draw sketches for paper based testing. Other artists use screens made in a graphics program of their choice, such as Photoshop or Illustrator.