Methodology II: Cognitive Dimensions and the Gulfs

This chapter introduces two useful high-level approaches that summarize a wide range of aspects of users: how users interact with artifacts and how users perform tasks. A type of analysis, Cognitive Dimension/dimensions, provides a way to represent common and important aspects of interface design. The dimensions are used to describe and then evaluate interfaces. Norman has a similar description of user behavior based on how hard it is to understand the state of the interface (the Gulf of Understanding) and how hard it is to perform an action in an interface (the Gulf of Execution). Both approaches are useful techniques for thinking about, planning, and performing interface design.

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