Participatory design is a method of giving the end user of a product a part in the construction and implementation of the design. It aims to bring together all the stakeholders in a project (users, designers, managers, etc.) at the earliest possible stage of development, before anything is set in stone. Often the method involves game-playing exercises, using pen and paper mock-ups, to help define how a product will be used. Using paper allows for many different designs to be imagined and for any number of changes to be made immediately and at minimal cost. In software design, one person usually plays the role of the computer by holding up a drawn version of the screen, and adding to it paste-on menus and function boxes. Users say what they want to click on, or write down what they want to type, and the paper screen is...