Step 2: Understanding Visual Representation(s)

In the second HCD step, the context of use, including the users and the user tasks and goals, needs to be identified, described, and analyzed. This step usually consists in a close examination of real situations in which existing products are used by actual users. Since the context of use in the UIPP project was specified by the Universal Cognitive User Interface project, this chapter discusses universal characteristics of visual representations in HCI. That is, it describes in detail central properties and relations, it discusses existing pictogram systems, and it proposes a taxonomy of visual representations. For example, it argues that always two central properties must be considered: the design and the reference relation. The goal of the chapter is to achieve a general understanding of visual representations that might be the basis for the following steps in the process as much as for other design projects.