Figure 3b. (a) Screen for the anatomic region of the thorax shows its subdivisions. After selecting an anatomic region, the user is presented with a subclassification giving further choices. At the bottom right, there is a button for returning to the main menu. (b) Screen for the thorax and the subdivision of the lungs. This is the first of various pages (five in this example) listing signs related to the subgroup. The rectangular green buttons on the left lead to the presentations of the signs. The oval orange buttons on the right labeled with an R lead to groups of related signs. At the top right, there are buttons for going forward and back to the other pages. Because this is the first of five pages, the back button is dulled out to show that it is unavailable. At the bottom right is a button for returning to the previous screen.