GUI Components. Our five basic components form the
structure of the UI and can be found in most UI frameworks
(See Figure 3, right). The Label is used for labeling text
input areas or images with a text string or image. The Soft
button activates a function (e.g., “delete contact”) when the
corresponding physical button underneath the on-screen
label is pressed. The GUI button is an iconic button that the
user navigates to and then activates (not directly accessible
with dedicated physical button). The List displays items
(e.g., contacts or text messages), in a list view. The Text
Area supports numeric or text input (e.g., phone numbers).