Doing object-action design starts with understanding the task. That task
includes the universe ofreal-world objectswith which users work to accomplish
their intentions and the actions that they apply to those objects (Fig. 2.6). The
high-level task objects might be stock-market listings, a photo library, or a per-
sonal phonebook. These objects can be decomposed into information on a single
stock, for example, and finally into atomic units, such as a share price. Task
actions start from high-level intentions that are decomposed into intermediate
goals and individual steps.